One more cent to the topic.

Just two days ago, while visiting the customer (just courtesy) I witnessed the H35D Linde forklift towing the two empty freight carriages. When I suggested it's not a best application for the forklift, the cutomer answered, that he needs to tow the carriages once a week or two and there's no need to buy a special tractor for this. The truck manages very good.

Somehow - I understand him. Specially, when there's no drivetrain risk for the trucks with hydrostatic transmission.
When overcharged, they simply "switch off" the traction (the relief valve opens).