I don't believe my gen has any thing checked as for the rear bearing or valves ran mine doesn't have a slide on the generator
what would be the best way .
Thanks
Which model of foretravel and what model onan generator, I have removed many generators from many coaches and if all else fails use a floor jack.
There might be slide rails on your coach, but not on rollers.
The Onan is on a slide, there should be 2 bolts on the outside and 2 on the inside. Next remove the exhaust pipe where it goes through the wall, disconnect the power cable and start stop wires. Using a floor jack on a concrete floor jack up to remove pressure on the angles and pull out very slowly, remember this guy weighs about 400lbs.. Once you get it out, put a ad on Craigslist and sell it, replace it with a Onan Micro-Quiet 4000.
No idea if a gas or diesel, but if it is the diesel, I would rethink selling if for a gas unit.
Most likely propane
Don't know if the coach is a diesel or gas model, so hard to say it is a propane generator