When a Ram 2500 Laramie 4x4 owner set out to tow his 32-foot toy hauler, he thought he had the perfect truck until he stumbled upon a wave of concerns that left him asking if he made a costly mistake.

Finally, there’s the biggest toy in the collection; a 2019 MAN TGX 18.640 truck with a Rolfo Auriga six-car, double-decker trailer. Powered by a 600-hp six-cylinder diesel and with a 12-speed ...