Evaporative Coolers for Lance

Thank you guys for the replies. NRA, I do have the electrical box, and also an A/C breaker. It looks like the Dometic, and Coleman are the two most popular units. I will have to look at them. I read where some units have the control panel built into the AC unit, if I read that correctly. Due to the fact that RV repair service is so backed up around here, I believe I am going to attempt this. Wiring isn't my strong suit, but I do have the three wires in that box. I assume these connect to the AC unit. If there is a remote thermostat, I assume that would have it's own wires, that would have to be fished to the AC unit?? It looks like a lot of YouTube in my future. Given that is is a 9' camper, I would think a low profile/moderately powered unit would work. Anyone have any input on Dometic vs Coleman? MORSNOW, how did you like the Mach 8? Thank you again for the information.