The wife, cat and I have lived the last 12 years in a 24 foot C class RV, a tad small but livable, a 28 foot trailer would be a bit more comfortable, get one that has a decent bathroom and enough counter space in the galley, and make sure that you have a Dometic A/C not a Coleman, the they do not work after 96 and humidity.
Main land in Yucatan is very hot and humid, Mexicowanderer is correct on the climate, you will need to have a good reliable gen set with plenty of fuel to last the nights, as for the truck, make it useless for the narcos to want, a small fifth wheel will be a better choice, and equip the bed with a permanent hitch and a spare gas tank, and side lockers, and stuff, in other words useless for carrying bulk cargo.
Viviendo la vida loca in Mexico
navegator