Glad you found iRV2.
The Dodge chassis usually had the 440 cubic inch engine, or maybe the smaller 360.
I any case they are strong engines with the right maintenance and not run too hard.
The tires may look good, but you need to look at the date codes. 5 or 6 years is pretty much the limit and dry rot will kill the tire.
Make sure all of the water, electrical and waste systems work.
First thing to do is to change all of the fluids, transmission oil, engine oil, generator oil, grease the chassis, change the antifreeze and check the brakes and grease the front wheel bearings.
Look for signs of water staining on the cabinets, walls and ceilings. If it smell musty or damp, there is probably a water leak.