Just to add my 2¢ worth... I'm the owner of an '83 Burro
, the direct ancestor of your U-Haul
, so I am facing many of the same challenges you face. I agree with Pam G. that originality doesn't carry the same cachet that it does on other types of vehicles and can be trumped by utility and upgrades.
The hubcaps are an issue you might want to reconsider. The "common wisdom" is that U-Haul removed the hubcaps so that there would be easier access to the lug nuts, which should be checked for tightness every time you hook up to travel. (OK, I admit I don't do it as often as I should, but "Do as I say...")
I found one of the original stoves on this forum. It was being discarded, and although I have it installed in the gaping hole my Burro
came with, it's never been hooked up to the gas. I find a 13 footer a little cramped for much cooking and use a Camp Chef™ stove and oven unit on a table outside
of the Burro
whenever the weather allows.
Your door sag problem may be with the frame/trailer body rather than the hinge. The PO of my Burro inlet some reinforcing in the body casting so the hinges would have a solid base to which they mount... problem solved!
If you still have the "Swamp Cooler" air conditioner mounted, be aware that in most places where it will be used, it will be pretty ineffective. It simply works by evaporation of a water supply, which in a high humidity environment doesn't do very well. I have a FanTastic™ fan unit that will probably go in sometime in the future, but a simple vent gets the job done most of the time.
I would suggest you go through the archives here for some really neat photos and suggestions showing what other folks have done with their FGRVs (not just U-Hauls & Burros, either.) I plan to do a bunch of them as soon as I can get "a round tuit."
PS Upon rereading your last post, I am also converting the front bench to a mini-dinette. I camp alone, and for one or two people, I think it will be a great solution to space allocation. As for the AC... I've never seen one small enough to not overwhelm the weight
of the little 13 footer yet large enough to really benefit. As stated above, a fan is my solution. I even got one of those 12 volt units that plugs into a cigarette lighter and can be placed strategically with the included clip-on base wherever it is needed.