Was looking at megacab, but then realized that can't laydown properly in the back seat being 5'10" and 6'2". So looking at a used cascadia with a propride 5th wheel hitch. Would have me with a cdl and my husband and his service dog. While we tow the larger 5th wheels. Knows can go through a carrier for what loads I want. My question is can he ride with me? Is there anything I should know about owning a cascadia?