We tired to rent a tow dolly from Uhaul when we bought our MH but when they put the car in their computer and then the MH it said our car was 50 lbs to much. That is GVWR. That means with people, luggage, etc., in the car. I told the guy no one was riding in the car when we pull it on a dolly but he had to go by his computer.
So I went to craigslist and found a new Kar Kaddy SS for 1/2 what it sells for new.
Since you don't want to buy one you might check your local RV lot and see if they have rentals. Also, the RV maintenance place may have a customer that will let you rent theirs. I had a lady that works in an Rv maintenance place needed to borrow one and one of her customers said she could use his.
Good luck and hope you find one.
Retired Army, Disabled Veteran
Wife, me, and 2006 Coachman Cross Country 372DS makes three, Demco Kar Kaddy SS