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Topic: 1991 u300 monocoque chassis good or bad thing (Read 978 times) previous topic - next topic

1991 u300 monocoque chassis good or bad thing

We have owned our gv now for 4 years and have always wondered what the monocoque chassis was made of(aluminum, steel?) and whether anybody had ever had structural problems. We had to replace the framework under watertanks due to corrosion as watertanks were seriously sagging. Are monocoque chassis any better than conventional chassis?
Andy & Liz
1991 U300 40'

Re: 1991 u300 monocoque chassis good or bad thing

Reply #1 –
The monocoque chassis is one of the best in the world.  Think of it as a unibody-- virtually all vehicles have gone with it.  Prevost uses it, MCI used it, etc.  Basically the whole structure is used to strengthen resistance to twist, not just two frame rails.

Your Foretravel uses steel in the structure-- finding beams is easy with a magnet.

And as far as issues, be sure you have read: Bulkhead Repair-- A Comprehensive Look REVISED
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: 1991 u300 monocoque chassis good or bad thing

Reply #2 –
Quote
Your Foretravel uses steel in the structure
One exception: the roof structure is aluminum.  I have the same year/model/floorplan.  On cold morinings you may notice the two hall doors get tight at the top when closed.  Aluminum shrinks more than steel with temperature drop.
John Fitzgerald
1991 U300 (SAI) Side Aisle Island Bed 40'
Detroit 6V92 with Allison Retarder
Meridian (Boise), Idaho