They purchase damaged (salvage) motorhomes and haul them to their property to part them out. Engines, batteries, generators, fluids, and some interior parts are removed before putting the remaining chassis out into the yard.
Just like regular cars and homes, motorhomes are often damaged by accidents, fires, and even severe weather like floods, tornadoes, and hurricanes.
If damaged badly enough, after settling with the insured person, an insurance company will auction off the totaled RV. Visone has multiple semi-trucks to pick up these damaged RVs and transport them to their RV salvage yard.
Remember that there are hundreds of thousands of motorhomes out on the road. And they have been around for decades. Only a small percentage of motorhomes meet their end this way.