Hammersley:
I have owned a 1987 Avion model 32S for almost two years. I've towed it a little more than 48,000 miles through all 48 contiguous states. I love the trailer and can tell you without any reservation, they are as good as any travel trailer ever built. I say that after owning four Airstreams. They are all aluminum aircraft type construction with a very thick 10. 5" boxed steel frame. All the appliances are top quality and will fit through the entry door. Avions have a lot of quality features that are rare. One is very high quality construction with sprayed-in foam insulation between outer and inner skin.
The unit you referenced is a model 34X. From my 1987 brochure (identical) the dry weight is 6,880#, dry tongue weight is 620#, and the GVWR is 9,500#. Fully loaded for travel you should expect it to weigh 9,000# with a tongue weight of around 1000#. They are well balanced front to rear and side to side, are much more aerodynamic than square front TTs or fifth wheel trailers, ride smoothly, and tow great.
The skin is anodized aluminum which has, as I understand it, a very thin hardened surface coating. If they are polished twice a year they retain their sheen for a lifetime. If not polished, the aluminum oxidizes and turns dull and chalky. Avions don't have a clearcoat finish like Airstreams that dry and peel off. The old aluminum constructed Avions like that one will last a lifetime if you don't wreck it.
The major problem to look out for is floor rot. The aluminum body seams are caulked and sealed from the factory but if not recaulked every few years the caulking will dry and crack and the seams will become subject to water leaks. If water enters the walls it will find its way to the floor eventually. If neglected over a long period the floor, which is made of layers of marine plywood and styrofoam insulation, will rot.
I notice that trailer has a common problem that mine has and that many others do also. The rivets securing the aluminum belly skin to the frame wear through the skin over the years and miles and some sheets will separate and hang from the frame. I have had to drill additional holes through the sheet and into the frame and reattach the skin with rivets or self-tapping screws.
At $10,500 the trailer could be a bargain if in good shape.
If you have more specific questions I'll be happy to answer.
There are at least two websites for Avions and at least two owner clubs, the Avion Travelcade Club and the Silver Avion Fellowship. I'll be at a SAF rally in Perrin, TX (small town near Ft. Worth) all next week.
Harvey