https://www.reddit.com/r/Workbenches/comments/117ugjg/best_way_to_rent_a_truck_for_700_mile_round_trip/
If you have a vehicle that can tow a trailer, uhaul trailers don't charge mileage.

https://www.quora.com/Can-you-rent-a-U-Haul-with-unlimited-miles
Haul does not have unlimited miles on any of their rentals. In-Town rentals you pay for every mile you drive and on One Way rentals, X amount of ...

https://www.uhaul.com/Truck-Rentals/Pickup-Truck/
Find a pickup truck rental at U-Haul for as low as $19.95, plus mileage. Use a pickup truck for diy projects, moving items in town or as a replacement ...