I have used a 24 x 60 hitch rack for two 2500+ mile round-trips from Louisiana to Colorado. With a family of four in the Jeep, that was essentially all the luggage space we had. Also got a weatherproof vinyl "cargo-bag" that fit well in/on the rack, and gave us 20 cu ft of "trunk" space. Probably as much as some little economy cars.
Worked flawlwssly as far as I was concerned. Mine is not a "high-rise" version, so it would have severely limited rear departure angle on the trails. That wasn't a problem for us, though, since we just unloaded and removed it when we reached our destination, and then hit the trails.
I did get some cheap trailer lights from Wallyworld and attached them to the rack, since the cargo bag pretty much obscurred the Jeeps taillights when viewed from the rear.
'03 red Rubi