I have purchased 2 RV's and sold 3 RV's though PPL and have been pleased with their service, except for the inspection process they sell you.
They have a list of what they inspect and it pretty much covers the RV components. The inspection is a "did it work? Yep. It must be good." They don't go into looking for water damage. I'm not talking about obvious damage, but taking 30 minutes to an hour to tap on all walls, floors, inside closets, behind drawers, to see if there are stains or soft spots. They also don't check the water heater to see if it works on elect, only on propane. No engine/chassis inspection. They don't note that the tires have a date code of 7-10 years ago. They do note if the tires have dry rot, but if they look good, that's it.
Bottom line, spend 4-6 hours doing your own inspection or hire someone to do it. Do note though, that you can spend as much time as you want inspecting everything which does not require battery, propane or AC power to inspect. You sign in at the desk when you arrive at PPL and then spend all day looking at RV's w/o anyone bothering you or trying to sell you something.
For the seller, PPL does all the paperwork and dealing with the money part. The buyer and seller never meet, or talk.
You will find that the majority of the RV's are under $100K, most being under $30K to $50K. Partly I suspect because of the 10% consignment fee. People tend to balk at paying PPL $15,000 to sell a $150,000 rig. PPL doesn't do anything additional for the $15,000 fee than for the $3000 fee. I have often wondered why they don't have a sliding scale for expensive rigs. However with the shear number of units they move they don't need the business. Their lots are crammed with RV's.