I have a 2012 Tiffin 34 TGA I love the layout, and every thing about the coach except the shoddy craftsmanship. Unfortunately Tiffin seems to have no quality control, at all. I do like the power train. I live in Idaho, and have to do a lot of climbing both coming and going, and seem to have enough power. I tow a 2007 Jeep Liberty, which is just under 4K and I have no complaints about the power.
Dennis