Make a comfortable offer
I have an 85 32' Elandan too. Just got a new PVC roof on it, as it wasn't garage kept, and the caulking had cracked on both AC units, vents, etc.
So if you get yours, RENEW ALL CAULKING before parking it outside!!
I've also eliminated the rooftop ACs and installing a single ductless mini-split into it. Also installing solar and some other goodies.
Had to replace microwave oven, fridge, bathroom vent, carpet, etc.
Upgrading sinks and toilet, showerhead, master bed, and other smaller details here and there. Hoping to go tankless with the water heater too if the unit will fit. (It normally would, but the tank is remote on mine, and that may be for a reason... fingers crossed!) Also ordering a new awning cover as the old one was toast.
Yours is probably a GMC or Chevy with the 454. Easy engine to maintain and repair, kind of a gas guzzler, but has plenty of power to make the thing move pretty nicely, and it's got a good reputation as a reliable mill that won't be overworked by pushing the RV around.
Mine had new tires on it, so that was part of its worth, which I didn't mind paying a lil extra for. That should probably be the first thing you check on and do. It feels like driving a boat down a highway, so tires are one thing you don't wanna have any doubts about! (replace the spare in the rear boot too, because it's probably dry-rotted)
The fact yours has been garage kept is actually a great thing... wish mine had been.... because I may be painting mine too in the near future. Yours probably won't need it.
Another note about the roof... mine had a fiberglass sheet roof on it that I assume was factory. I didn't like the way it had a major seam right down the center from front to back, so check to see if yours does... if so, make sure to cover that bastidd with the appropriate topical sealer. I don't know what it's called, because I'm new to this stuff too, and still learning. My new PVC roof is one single sheet now, so one less thing to worry about. Heh!
My stock house battery charger worked just fine, but with the house batteries dead, I'm upgrading to Lithium batteries and a charger inverter that can maintain them, as the stock unit can't. If you do such an upgrade, make sure your battery maintenance system is lithium compatible!
For yours... I'd offer 3 to 4k. More if you feel it's worth it... and it very may well be. But as always, pay as little as you can.
Let us know how it goes!
Jack