If you have have to ask that question you don't need one.[img]/wwwthreads_images/icons/wink.gif[/img]
But, IFS might, be better for jumps and stuff, but then again it is not strong enough for jumping. So solid axles are only good for EVERYTHING except a smooth ride that isn't that bad. [img]/wwwthreads_images/icons/smile.gif[/img]
It might not be the case that you don't need one, its just that you haven't been informed of the pros and cons. The pro's are many, Its cheaper to lift, cheaper to maintain, stronger to put larger tires on, flexs better... Cons, leaf sprigns don't ride all that well. Evan, AKA The_kid was considering doing a coil setup on his solid axle swap. Also you might be better off asking on the SFA board. Most of the SFA (solid front axle) guys probably check here enough to read you post anyways though.
Desert. You'd probably be better off running independent suspension for the desert, but thats not any kind of independent suspension that comes on a ford explorer, and its nothing like the IFS that comes on a chevy truck. Those desert trucks are seriously beefed.
I would go with the superlift, well im shure you knew that b/c that swhat I bought for my truck.
Anywhay, it is very strong and it is not too expensive but I would say it is the best lift for the money. you can a 36x12.50 on 10" rims with this lift, well I could. I would recomend 35x12.50 or wider swampers.
for high speed desert running your best bet is going to be a long-travel IFS system. You're looking at a lot of money though, the Toyota long-travel systems are around $4-5000 if I remember correctly. I don't know if anyone makes a L-T IFS for full-sized Chevy's. So if may have to get one custom-designed and built. That could easily clear the $10k mark when you figure in man hours.