I tow a Lexus GX470 which weights around 6,000 lbs. My coach is a 1999 36' Alpine with 330 hp ISC engine. I do notice the SUV when pulling a steep grade like up hwy 395 from Bishop to Mammoth Lakes, but other than that the impact is negligible. Also, I can't tell a different in the MPG for towing verses not towing. One thing I am going to buy in the near future is a Ready Brake and get rid of the surge brake that I am currently using. The surge brake is a pain to keep operating properly.
1999 Alpine Coach MDSS - 2003 GX470 Toad
Roger, Christine, Isabella(7), & Sophia(2)