Captain Stan, glad to see that you bought a braking system for the Jeep. In a panic stop, I'm sure you can imagine the pressure put on the hitch system from that 5,000 lb. Commander without brakes. I think in most states you have to have an auxiliary braking system on anything over 1,500 lbs. Whether it is the law or not, it just makes good sense for the toad to have it's own brakes just in case it ever becomes disconnected.
As dverstra mentioned, slow down and enjoy the view. We travel at about 58-60 mph and have averaged about 7.5 mpg over 65,000 miles. We weigh in just over 40,000 lbs. which is probably a little less than your 45 footer.
And, as Executive mentioned, get the coach weighed so that you know how much pressure that you need in the tires.
MM.