Is there a steel spare on back...?

No steel spare wheel, in fact no spare at all. But I have the 4 wheels, I'll use them to mount winter tires. Interior parts are surprisingly clean, except the front seats which are torn in some places. It has manual seats.

My concern with lying to Uhaul is the liability.

When I was moving about 900 miles a few years ago, I had some idiot hit ME going down the highway. He actually hit the trailer, not my tow vehicle, but if I was towing a Disco with a Disco, and I had lied on the paperwork, both Uhaul and my insurance carrier might decide to use that to not pay out.

So nowadays, I'm worried about the other idiots much more than I am, and I've realized you can drive better than perfect, they will still hit you, and if your ducks aren't in a row, you are now a bad guy, too.

Then I'm responsible for the other guy, AND the Uhaul trailers, which are overvalued in terms of replacement cost...not to mention whatever I lost on the trailer.

I dealt with them a week ago, and the tow rating for a Disco I is now at 5500lbs, but the problem is that that 80% is not a suggestion (in terms of gross weight). Your tow vehicle had better damn well weigh more than 20% of the total weight of what you are pulling, or they don't rent to you.

That, and they have the hitch rated at only 5000lbs or so, not the 7700lbs from the low gear tow rating.

So, I thought about lying to them, but if something goes wrong, it's going to cost a lot more for that lie than if I just used another towing vehicle. I rented one of their 14' trucks to tow with. It braked very well, and had plenty of power. Got 7.5mpg in it, though. :-/