Same experience as SuperD towing my 2010 Wrangler Islander - no sign of anything hitting it with its height... With a 3" lift kit on an Unlimited - I expect anything kicked up by the RV will sail clear underneath the Wrangler to the windshield behind you..
I use the Roadmaster setup - Flacon All-Terrain Tow Bar and Invisibrake... Nothing at all wrong with Blue Ox (or Roadmaster) - price was my deciding point - at the time I got the Roadmaster setup significantly cheaper.
Same type of wiring harness as SuperD - I used the Mopar version... About the same price... Using the existing wiring and lights is the simplest to me. They are plug and play from connector standpoint - in my case did require removing the right front fender to route wire... Got an interesting reaction from DW when she saw 'her' Jeep disassembled in the garage.
- but normal for many Jeep owners...