Best type of vehicle to tow behind a motorhome

What do YOU want from a toad? I really like my Saturn Vue as a toad, but I find it is to small when I want to take friends along touring. I am now thinking of either making my Toyota Sienna van towable (lube pump), or purchasing a Ford Flex. The new diesel should handle either nicely. I spoke with a fellow at a Rally who tows his Smart Car. He loves it. Also this weekend I saw a diesel pusher towing a large pickup with a flat bed instead of the usual rear, and an off-road vehicle on the back of the pickup. My daughter and family tow their Jeep, and love the off road travel offered by the Rubicon. So really, what would make you happy?