I don't use my 2010 TC behind an RV, but I did turn it into a little camper. Works great.
Not wanting to hack large holes in the roof, I didn't install the roof vent / fan, but I did mount a Yakima roof rack and install a 190 Watt solar panel, solar shower, kayak rack, awning, and hitch-mounted bike rack.
I've also got a comfy bed mounted behind the passenger seat, a toilet, water supply, two tables (one that fold out of the wall), and a 120 Volt inverter.
I don't have an issue driving something huge, I do it every day at work, but I do appreciate the compact size of the TC for ease of parking, great fuel economy, and a good ride.
Being 6' 4" I really enjoy the extra headroom the earlier models have. I can comfortably sit on my bed with my legs at a 90 degree angle below me, and not hit my head.
I can also kneel on the floor next to the bed, but this requires that I tilt my head down a little to avoid the roof above me. Still, there's plenty of room for changing into / out of kayak gear, or getting ready for bed while camping.
My only complaint, and it's a minor one, is the super-stiff rear suspension. I'm hoping I can find softer leaf springs to replace the cargo van suspension it currently has.
It's not a big deal on the highway, but bouncing down dirt roads while scouting out a good camp site, really beats the tar out of me!