^^ That's a nice fat insecure load ticket right there!
I had my current camper on my previous '93 Ranger (extended cab 4x4, 4.0L 4x4) and it was just fine. I had a 2" lift on the truck with no sway bars so corners were, well, interesting.. but it worked fine. I wouldn't hesitate about installing one on an '88 either. I installed mine on my '09 Ranger 4x4 with airbags and it worked very well, fuel mileage being the biggest issue (6-7 mpg loss on average). I honestly kinda miss having it on my truck, but DD'ing it 80 km/day sucks with the extra 1400 lbs.
From my personal experience I'd say buy a camper trailer instead. Compact campers are fine but they're more expensive than the same full size one I find, people think they're premium or something (more rare I guess). You can haul more safely than you can carry, plus you'll have at least 12 - 13' in a small trailer whereas you're looking at a max of 7' in a camper so interior space is a lot different. Plus, its much easier to hook up and drop a trailer than a camper. I'm going to be putting my camper up for sale pretty soon in hopes of finding a smaller 13' Boler or Escape style trailer and going that route. I can haul the quad in my pickup still. LR
'09 Ford Ranger FX4 with a mean owner