The 2.1L Diesel does real good, but you are correct, no hills to speak of. I have towed it to Florida and the Hill Country W of San Antonio. I would hesitate taking it Colorado, though. I wasn't happy with the RV alone on the downhill to Lake City last year. I'm sure the brakes were overheated. I have a BluOx Patriot brake thingy in the Jeep. The remote is flaky, but otherwise it works good. I have a BluOx tow bar as well. Had the Jeep modded by guys who know their stuff. The attachment is both bolted to the frame and secured with cables. They also wired the Jeep tail lights wit the requisite diodes to assure no electrical conflicts. I leave lots of stopping distance ahead. It is definitely a two handed drive with the Jeep back there, especially in cross winds. Averaged 15mpg towing the Jeep, vs 20 without. With a tail wind I got about 15.5, with a head wind, 14 or so. After a couple of hours, I almost forget it is back there.