Boards Under Duals

Topic: Boards Under Duals (Read 1207 times) previous topic - next topic

Boards Under Duals

April 07, 2020, 04:38:45 pm

OK. Here's a question. Is it really necessary to support both rear tires when up on boards? Since both tires are mounted at the same point, I'm wondering if you can support just one tire. Granted, it looks weird to have that other tire hanging but will supporting only one do any damage? I'm thinking you heavy equipment guys will be able to answer this one. Thanks.
jor

Re: Boards Under Duals

Reply #1 – April 07, 2020, 04:42:50 pm

Yes. Both.

Re: Boards Under Duals

Reply #2 – April 07, 2020, 04:48:08 pm

Agree. Supporting only one tire puts 2X the load on the other tire 24/7.

Re: Boards Under Duals

Reply #3 – April 07, 2020, 05:01:09 pm

The only time we do that with duals is when we have a flat tire on the outside then do so to keep from having to jack up and that only takes half an hour.. Too much unnecessary stress on wheel and tire long term..

Re: Boards Under Duals

Reply #4 – April 07, 2020, 07:34:17 pm

Got it. I'll have to make up another set. Still have one. The other ended up drying and cracking. Thanks.
jor

Re: Boards Under Duals

Reply #5 – April 08, 2020, 05:36:15 am

I used 2x12s.. layed them across to support both. MAYBE I'm wrong doing that..

Re: Boards Under Duals

Reply #6 – April 08, 2020, 06:23:28 pm

3/4" cdx plywood for rears, front and jacks. Sealed edge grain and area above & below. Holes drilled on all four corners to adjust w/ awning hooks.

Re: Boards Under Duals

Reply #7 – April 08, 2020, 07:30:38 pm

I've tried to get Mr. Bibendum in the crosswalk more than once but he's got the correct info here in the attachment.

Pierce

Re: Boards Under Duals

Reply #8 – April 08, 2020, 09:40:11 pm

School me here. Why are we doing this?

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Reply #9 – April 08, 2020, 10:57:34 pm

Keeps any moisture off the tires while in storage along with tire covers.

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Reply #10 – April 09, 2020, 08:29:16 am

Good thread, slight twist on the same question. Since its looking like our early summer plans are in flux with many campgrounds closed we will be spending some time with the kids and grandkids in Connecticut on our way up to Maine for the summer.

I've been contemplating how to protect their driveway from the weight of the rig while we "moochdock". It's a typical asphalt driveway, no idea of how thick. I like Mike's idea of using 3/4" cdx plywood with the four holes to move the platform around. I was thinking of gluing two sheets of 3/4" cdx to make it more rigid then seal to protect. Is this overkill?

Assuming this is adequate, what's a good size/dimension to distribute the weight best?

Thanks, J & K

Re: Boards Under Duals

Reply #11 – April 09, 2020, 10:29:40 am

Blacktop is temperature sensitive. If temps over 100 deg would need a bigger footprint than what would be needed for cooler temps. My driveway is crowned from driving the crane on it in the summers. The crane weighs 31,000 lbs.

Re: Boards Under Duals

Reply #12 – April 09, 2020, 11:15:44 am

Quote from: Beeman – April 09, 2020, 08:29:16 am

I've been contemplating how to protect their driveway from the weight of the rig while we "moochdock". It's a typical asphalt driveway, no idea of how thick. I like Mike's idea of using 3/4" cdx plywood with the four holes to move the platform around. I was thinking of gluing two sheets of 3/4" cdx to make it more rigid then seal to protect. Is this overkill? Assuming this is adequate, what's a good size/dimension to distribute the weight best?

Depending on the undulation of the driveway surface, a single pad would be best, as I've noticed mine have taken the shape of the uneven surface, which, I think, is better for the tires and jacks. A single sheet of plywood gave me 4 pieces 2' wide x 3' long for the tires and 4 pieces 2' long x 1' wide for the jacks. In retrospect, I should have glued foil-backed insulation sheets on the underneath of the pads to not only give a little cushion, but to provide water drainage underneath to protect the plywood. I think plywood works better (a suggestion from Brett!). Here's my site, it was a bearcat to level the coach (and I'm still adjusting it).

Re: Boards Under Duals

Reply #13 – April 09, 2020, 12:05:00 pm

Quote from: craneman – April 09, 2020, 10:29:40 am

Blacktop is temperature sensitive. If temps over 100 deg would need a bigger footprint than what would be needed for cooler temps. My driveway is crowned from driving the crane on it in the summers. The crane weighs 31,000 lbs.

And what do you use under the crane's jack pads? Reed and Cole uses two 2' by 2' pieces of plywood to make a 2x4 sandwich.

I have 6 2x12 pads for my tires left over from the previous rig, that except for all the wood screws, are ready for the fire.

I am making 1' square jack pads out of 2 layers of 3/8" plywood because I thought it was 15/32" when purchased. Oh well, another foray into the pestilence for more plywood and the ladder I forgot to buy.

NIAT RUC, Bring out your dead!

Re: Boards Under Duals

Reply #14 – April 09, 2020, 12:45:56 pm

Quote from: Old Toolmaker – April 09, 2020, 12:05:00 pm

And what do you use under the crane's jack pads? Reed and Cole uses two 2' by 2' pieces of plywood to make a 2x4 sandwich.

NIAT RUC, Bring out your dead!

My tubes are made out of chrome moly and the truck is much lighter than most cranes. If you blow the picture up, you can see that I only have a 12"x12" metal pad for a foot.

Re: Boards Under Duals

Reply #15 – April 09, 2020, 01:14:59 pm

Quote from: craneman – April 09, 2020, 12:45:56 pm

My tubes are made out of chrome moly and the truck is much lighter than most cranes. If you blow the picture up, you can see that I only have a 12"x12" metal pad for a foot.

Reed and Cole ran a 150 Ton *I think* telescoping Boom crane.

Re: Boards Under Duals

Reply #16 – April 13, 2020, 02:53:33 pm

OK. Good to go with a new pair on each side. Gives me 4 1/2" from the blocks plus the air bags all the way up on stands. A real pleasure sliding under there! Good to go.

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Reply #17 – April 13, 2020, 04:22:41 pm

Nice job Jor,
I made ramps from 6x6 treated cutoffs from deck and porch framing at HFH.
36" ramp and 18" stand. I made 4. One for each front tire to lift the front an extra 5.5". Two on each pair in the back for the same lift.

I also have ~18" x 18" x 1-7/8" squares, LVL cutoffs from big headers.

Sure makes a difference working underneath. A pit would be nice.

Re: Boards Under Duals

Reply #18 – April 13, 2020, 05:49:13 pm

Quote from: jor – April 13, 2020, 02:53:33 pm

OK. Good to go with a new pair on each side. Gives me 4 1/2" from the blocks plus the air bags all the way up on stands. A real pleasure sliding under there! Good to go.

Nice job, Johnny! My only suggestion (especially down here) is to treat them with Minwax or some kind of spar varnish so they remain stable and protected.

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Reply #19 – April 13, 2020, 08:06:01 pm

Quote from: jor – April 13, 2020, 02:53:33 pm

OK. Good to go with a new pair on each side. Gives me 4 1/2" from the blocks plus the air bags all the way up on stands. A real pleasure sliding under there! Good to go.

Jor,
Nice Job Tocayo! What type of wood are you using? Do you have dimensions for them?
John M.

Re: Boards Under Duals

Reply #20 – April 13, 2020, 09:14:40 pm

Looks to me that he used fir

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Reply #21 – April 13, 2020, 10:05:49 pm

I used 2x10 Douglas fir. (4' & 3' & 2') 2x12 would be better but these are heavy enough for me. Last time I made some up I used some pressure treated stuff but surprisingly it cracked quickly. I just slather linseed oil on this stuff. That's what I had on the shelf, Mike.

I have another small set with 45s on both ends that I use to get this thing out of my driveway.
jor

Re: Boards Under Duals

Reply #22 – April 13, 2020, 10:27:25 pm

Jor,
Thank you!
John M.

Re: Boards Under Duals

Reply #23 – April 14, 2020, 11:11:51 am

I drilled holes on all four corners on mine so they could be adjusted with my two awning hooks; works great.

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