One side note, and this is not related to the chassis:
Your generator's carb is probably shot. It may be old enough to be rebuildable, but most likely it will need to be replaced. Change the oil as well, because it is likely sludge. Heck, I would probably use an oil evac pump down the dipstick hole just to suck up the old oil, add oil to the fill line, try to run it, then change the oil again just to get out all the chunkies due to it sitting for so long.
I'd also replace "consumable" items like house and chassis batteries as well.
