My son just picked up a 27' Jayco LE + tongue length and rear bumper, about 31'(can't remember the exact model) one slide out, comes in at about 7000 empty. We towed it with empty water tank, no grey, no black, 2 x 30lb propane tanks and 1 GP 24 battery. With the WDH and sway engaged, on the flats and going uphill was fine at 55 - 60 mph, going downhill even on long gentle hills was nothing but white knuckle experiences, had to slow down considerably. He had to activate the manual override quite a number of times. Transports passing us, ended up with what's that funny brown smell, get the hint. As for the power towing, it was surprisingly adequate, no effort, no engine screaming or downshifting past 6th. In my personal opinion, that trailer you plan on getting is far to much for the truck in general for any trips. He moved his to a seasonal campsite where it will remain for a number of years. I don't plan on being on the return trip with him. I have an older 22' and tow with none of the above problems. For you to be on the safe side, I would recommend on sticking 24' or under or going to a more capable truck, ie, 3/4 Ton, not for the power but the control of your truck/trailer combo.