I believe a few companies also make models that are mounted up higher on the vehicle (roughly between a regular hitch mounted rack and a roof mounted rack in height) to increase departure angle, while still not being as top-heavy as a roof-mounted rack. Instead of having a big box to deal with right at hitch level, it's only a square steel bar. It's probably the equivalent of leaving a hitch mounted winch on.

I will say I haven't needed to secure very much outside my vehicle since 1995 when we bought a 2500 Suburban. If the Envoy can't carry it, the Suburban usually can, with room to spare. That thing is great.