I believe you should have as much rear travel as possible with IFS. Since the front end doesn't have much travel, the load is transfered to the rear. When I did some mods to my 96 4Runner to gain much more articulation in the rear, it made my rig much more stable. Definitely go for it.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride