I took my '01/'02 Chevy RT 190P on some pretty rough FS dirt roads, but it was not an off-roader. It was unlifted. I think it helps a lot to know what's where underneath, so you can position it properly crossing bumps. Being a gearhead & tinkerer, I knew what was there.
Assuming it's on a Chevy, and not one of the last Dodge Ram Vans, RT started lifting the rear of the Chevy with blocks about then. If the one you're looking at doesn't have 2" or 3" blocks (don't recall which) between axle & springs, I'm pretty sure they can be installed. Not sure about the front, it may take new springs.
As PSW said, there's been a fair amount written here on lifting the Chevy B. I think it was about 5-6 years back. The diff housing is still the limit, but you can get the sewer pipe and Onan exhaust up, which would help.
Jim, "This beer tastes like I'm not going to work tomorrow."