First time owner of anything smaller than a suburban. Had a Yukon XL Denali prior to to escalade. It seems as if not enough power in reverse to hold the vehicle. We slide sometimes launching. I put the vehicle in the tow haul mode, but we still slide. It is all wheel drive like the denali so I don't know what else to do. Definitely do not want to launch at Shasta or anywhere there is a long ramp for fear of sliding too fast. Car stop sliding when boat floats, but it still is a little un-nerving. Is it possible trailer brakes are not working? Or wiring on car is not hooked up properly? Any suggestions?