Yes, a brake controller is a good idea. After all you got a 3800 lb camper behind you. I just got one from my camper dealer and do not not remember the brand. Others here can make a better recommendation. The jeep you are thinking about should come prewired for it. I do not know about how easy it is to move between vehicles. Mine was not too expensive, so just got a new one when I upgraded my TV.
HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Bruce" 2011 Dodge Durango V8 Hemi Crew
Just us gals (me, Sis and our daughters)
Traveled 19520 miles and 209 nights in 7 years and counting