I think the first truck has two chains if you look close . But I think they are different vehicles . so the camper is probable tail heavy too ,they tend to put the bathroom and holding tanks in the overhang part . also make note of the long tong extension required because of the camper overhang . probably if it was a gas motor it would just have lifted the front wheels of the ground . Now I understand why they put the hanger bearing and universal joint in about that spot ,good thinking on there part .