An auto car on a tow dolly?

Yeah my main concern is just the frame being able to handle it and my pickup brakes controlling it downhill (they work just fine normal driving, I totally redid them last year). On a flatbed it'd be a little sketchy, but on a dolly I think my Dakota can handle it. If I can't get a rental then I should be someone in my area with one to borrow

Wow it seems there's more than a few people out there that don't like rental stuff from uhaul.......
one of the reasons they ask what you're towing is because they have different width dollies. If you have too narrow a dolly, it might damage the fenders of what you're towing on a real tight turn. Recently, I dollied an 02 intrepid and I had to have the widest of the three widths dollies. As far as the tow vehicle, I used a 4.0L 01 Cherokee to tow a dollied 95 LHS(probably 4400 lbs), and I had zero problems. That said, I wasn't towing up or down any mountainous grades.