Only on the internet does a poorly written question get 3 pages!!! The OP asked a question with very little information. Then he got snarly because I thought he was bringing horses. DAH! Usually a horse trailer is used for horses! Then this fellow from Montana gave us a bunch of false information on Mexican trucks. They do not buy new trucks in the USA nor do they export trucks to Canada or the USA. Rocmcoc may not have answered all the OP's questions but he did give the OP a heads up on importing the truck and trailer and also provided a link for further information. This is an RV forum and the OP is not a tourist nor an RV'r looking for RV info.
Moisheh