Towing rigs get expensive fast between insurance, higher fuel consumption, and routine maintenance. You usually find softer pricing on trucks and SUVs in late winter when dealers want older inventory cleared, but those vehicles rarely come with every piece of towing hardware you need attached.
A proper heavy-duty setup runs about $650 once you include the receiver, wiring harness, and shop labor. When you buy the vehicle, negotiate the truck price by itself and leave the aftermarket parts off the auto loan so you are not paying interest on accessories for five years.
A 0% intro rate is a fixed timeline, not free money. If you have an unpaid balance when the 18 months wrap up, the standard variable APR kicks in on whatever amount is left.