Well, if this guy just wanted the best DD street tire, yes, those LE2's are up there with Michelin MS2 and General HTS. I know you thought you were joking, but for only a slightly different person, you gave excellent advice.
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im going to have to agree with this... id go LE2s or the destination ats. get them a tad larger than stock and call it a day. i know the LE2 is a high all-season, but they do have a somewhat agressive/modern tread pattern to them and all the reviews i have read have been positive as hell.
the destination is a tried and true a/t, with little to no complaints from owners.
check out hercules tires too, the terra trac II is a nice tire
Tires I approve of fully in this particular case from mild to aggressive:
OP, if you want "beef" in terms of size, that's just a matter of buying a larger size. Assuming your XJ is a 4.0 auto, you have 3:55 gearing and can do 30x9.5 well enough or even 31" tires decentish (I'd personally regear for 31" myself, though) assuming you have the clearance for them. Bigger than that and very few people are happy without regearing (and lifting, trimming, bumpstopping are mandatory). The larger and/or the more aggressive the tire, the more your XJ will guzzle the gas.
If I was having to do a CO to IL drive on a regular basis with an XJ, I would not be using an aggressive tire at all. The XJ is already a thirsty vehicle--no need to throw even more $$ away on gas if I could avoid it. If you don't go wheeling with your XJ, use one of the first three tires I listed. They'll save you TONS of money in gas in the not-so-long-run.
P.S. If I was driving between CO and IL often, I wouldn't be using a 3" lifted XJ at all. I'd get a much more fuel efficient vehicle to use. Purchased at a good enough price, the thing would probably come close to paying for itself depending on how often that trip is made. Or I'd use a bus/train/plane to get to and from home when necessary. Making that drive often with an XJ is just plain dumb for a college kit imo, but maybe you're a rich kid who doesn't need to worry about money like others do