I towed my 3300lb 18' travel trailer a little over 200 miles this past weekend. I reset the trip odometer and MPG system and I averaged 14.4 MPG for the trip. When not towing, I am getting about 20.5 MPG.
Here are a few pics of my Tow Pro Elite installation from two weekends ago. I used a Redarc round mounting panel (part# 331-TPSI-003) which is made for of all things...a Chevy Colorado. It actually looks pretty clean in place of one of the 12V outlets. I had to slightly modify the mounting panel...