Looking at the pictures, that camper looks to be a simple / basic "RANGER MODEL" manf. by Four Wheel Pop-up Campers.
The Ranger model is 8.0' feet long.
Approx. 800 - 1000 lbs.
It probably has the sink, stove, propane, water, cab-over bed, couch, small clothes closet, NO Furnace, NO Refrigerator (at least the camper in the pics doesn't have those) -- Just an Ice Box, built in ice chest. Don't see any camper jacks, so you will probably have to use a set of portable cable jacks to get it on/off your truck.
Looks like it has been outside in a wet area (roof trim on rear of camper is moldy with green)
Over-all outside looks to be in decent condition.
Inside picture looks good too.
These days it is hard to find a small / mid sized truck with an 8' bed.
The Ranger Model is designed to fit on the Toyota Tacoma, Ford Ranger, Nissan Frontier, Dodge Dakota, etc.
Some camper mods might be needed to make it fit on the truck you end up buying.
Camper will probably be sticking out the back of your truck a bit.
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