I have the 2012 LTZ auto version and hooked it up to our 22ft Paramouint for a test drive last Friday. I asked the dealer whether I would need to upgrade suspension etc... We attatched the van, the back of car hardly went down, so no was his answer :)
I can't say I noticed the van at all until it comes to stopping and I noticed the elec brakes were on a bit much... With some tweaking that will be sorted out.
As we have yet to pick the van up I can't say how it will go on a big range for instance, but from the little run we had I an confident it will be fine :)