Where would i install a tow package . u haul ?

I've had a hitch installed by u-haul before and had no problems. I'm sure they do brake controllers and wiring all the time so I wouldn't have any problems with them doing that either. I've never thought of u-haul doing trans coolers, bu I guess that makes sense. They're not hard to do, and I installed mine myself. It is a good price for the amount of work they're doing.