My diesel has a tranny temp of 220 At 70 mph. Do you notice any alarming temps pulling the trailer?I installed the curt hitch/wiring harness myself. It was a piece of cake. I tow around a 5x8 utility trailer with it. I've moved several loads that were approximately 2000lbs gvw on the trailer and the cruze didn't even break a sweat. The brakes handled it just fine as well. Granted I wouldn't have wanted to go down a 5 mile mountain overpass...a 5 mile drive across flat Erie was no problem. I also moved my trailer full of firewood without incident.
Biggest thing is to know how to load a trailer. If you know this you won't be sagging in the rear. My rule of thumb is that I should always be able to pick up the tongue myself.
I've got mine installed by me, it's not a big deal you just need the right one for the diesel because it has to go around the DEF tank and behind the tail pipe which you need to lower it in order to get behind it. See my post here:Any of you guys put a hitch on your cruze yet? If so which one did you choose and are you liking it so far?