You shouldn't have to. Check the obvious first. What kind of truck is it? If it's a later models vehicle be sure and check all fuses first. The trailer lights are on their own circuits now. Double check ground wires too.
Again, shouldn't be a reason to rewire. If you come up short of ideas give me a call at the shop. I do this for a living.
479-524-0111 I'm there 9-5:30 central time.