I have three kids in an XJ. my thoughts
-same question as above: Are you getting stuck on 31's? if not, don't worry about 33's unless it's a looks thing, (which I completely understand, btw.)
-Check out roof top storage boxes from thule/yakima. they add a ton of cargo space. I can fit our tent, sleeping bags, camp chairs privvy shelter, sleeping pads, etc up there, and leave enough room in the back for a well stocked kitchen.
-Next to the long cargo rack is enough space to carry quite a bit of firewood, though it's a lot of weight to put up high, (something to consider). I'd also look into getting a hitch mounted cargo rack. you can load it up with firewood and then just drop it when you get to camp.
-shop for a good, solid spare tire carrier to get it out of the load area, if you haven't already. Good brands are JCR, AJ's offroad, Detours USA, Logan's Metal works, ARB, etc.
That mod will allow the tire to be placed outside as well as create a spot for fuel/water can(s) or storage box on the swing-away.
-Invest in a Trasharoo once you get the tire carrier for even more storage hanging off the tire.
If you do all those things, choose compact or space saving equipment (think backpacker's gear) and still need more room, then definitely look into a smaller utility/military trailer.