I had a Garvin Wilderness rack on my jeep when I bought it w/ a 31x10.5 BFG up there..
To start with its a very beefy and well built rack ( heavy ). W/ the 31x10.5 up there and running 31x10.5's I could barely fit in my garage. So if your plans are to stay small then go for it.
BUT, if you park in a garage, parking deck, etc. then think twice about it. Also when you add something like a 33 up there its basically like running a sail on top of your jeep.
I sold mine b/c w/ 33's and 5" lift I couldnt even begin to fit in the garage or parking decks. Also where we wheel you run a huge risk of getting that thing hung up on trees/rocks and it just wasn't worth the hassle.
I carry my spare inside along w/ my gear and have not had any problems yet. ( I carry a full size 33, spare shafts, hi-lift, powertank, handtools, recovery gear, etc. in the back of the jeep and haven't had the need for a rack yet). All w/ the rear seat still functional.