I have thoroughly audited Home Depot truck contracts many times and don't believe this to be true. Do you have a source? I have never seen "secret" fine print beyond the agreement which is embedded badly in https://www.homedepot.com/c/Tool_Rental_FAQ . People use these trucks for work all the time, and I use their trailers very frequently to haul all sorts of things.

EDIT: I realized I have plenty of these contracts archived and don't need to believe HN conspiracy theorists:

(a) Use Restrictions. The following restrictions apply to the use of the Vehicle:

• The Vehicle will not be operated by anyone who is not an Authorized Driver;

• All occupants in the Vehicle must comply with seat-belt and child-restraint laws;

• The number of passengers in the Vehicle will not exceed the number of seat-belts and child-restraints;

• Renter will only operate the Vehicle on regularly maintained roadways;

• Renter will ensure that keys are not left in the Vehicle and will close and lock all doors and windows upon exiting the Vehicle;

• Renter will not (i) transport people or property for hire; (ii) tow anything (with the exception of an attached trailer if rented pursuant to this Agreement); (iii) carry or transport hazardous or explosive substances; (iv) engage in a speed contest; or (v) load the Vehicle or transport weight exceeding the Vehicle’s maximum capacity;

• Renter will not engage in reckless misconduct which causes the Vehicle damages or causes personal injury or property damage; and

• Renter will not use the Vehicle for the commission of a felony or for the transportation of illegal drugs or contraband.

So unless you are trying to reuse the vehicle for hire or tow a non-Home-Depot trailer (which I admit is kind of restrictive, but nothing like what the parent post says), it seems fine.