I use these, which may be the Lynx referred to by others.
At this very moment I'm on a hilltop in Colorado and the driver's side tires are up on the stacking blocks.
The issue is, really, that the P30 chassis was built to a spec... and then the motor-home/coach builders said 'fuck that spec' and just built whatever they wanted on top of it. Extra axles, lengthening the frame to absurd levels, not changing specs on brakes, etc. I had a 97 fleetwood that was 3000lbs heavier than the chassis rating, and 1000lbs heavier than what it's own label said it was (empty!)
One thing I see a lot on P30s is the front sway-bar bushings are completely gone. Enough so that the sway-bar is completely disconnected (only the bushings hold it on!) Take a look underneath, make sure that the swaybar is even there... without it in place and with solid bushings, that rig will be absurdly difficult to control, and a white knuckle ride all along. I like Energy Suspensions poly, super firm, makes the vehicle feel totally different. Check the rear sway as well.
Front steering bellcranks are commonly worn too. Give em a wiggle, if they move at all, they are worn out and the vehicle will just kind of have a bit of a mind of its own. Give it a good brake check. The ABS system sometimes goes awry and it's pucker factor 9.0 when you're rolling that fat bitch down a hill and the pedal sinks. At the very least, bleed and inspect the brakes and their pads, pretty much assured to not have ever been done.
Look at how low the front of the frame is to the ground. If you get a flat, do you have a jack onboard that will fit under there? Probably not. P30s are 'heavy' enough that you'll be calling a heavy wrecker for a tow, or paying for heavy-duty roadside, which can be spendy. Find a jack that will fit under there with a flat tire, and make sure you have a nice long lugwrench to get those lugs off. Keep em onboard. Also some 2x6's or Lynx Levelers so you can roll a flat up onto them to get some clearance. Also handy for leveling the rig on when camping!
Your tires most likely will be aged out, and dryrotted, before they wear tread down. If the tires are over 3 years old, or over 5 if they were covered, consider replacing them. Also, duals have a tendency to go low on air and cover it up thanks to it's neighbor, especially insides. Get a proper air gauge, and make it a point to verify all 6 tires PSI every time you stop for fuel. At the very least, when you start a trip.
Parking brake is almost assuredly crap, doubly so if it's an auto-parking brake. Get chocks, read up on how it works now (there are a few versions, and you can end up locked up and stuck if some versions fail.)
Another tip: If you are going somewhere with water, dont fill up. If you are going somewhere without water, fillup as close as you can to the destination. Lugging around 100 gallons of water (around 850lbs) adds a lot of annoying mass to your machine. Learn about the plumbing, water pumps, one way valves, water heaters, and pex pipes are very common failures that can end your trip!
