Thanks for all the input. I have mixed feelings. I missed one that "Looked" from pictures and description to be very nice and similar and I asked seller what it sold for and they told me $4500 - ouch. Listed for $6, I would have snapped it up at near that price.
This one did not show water damage but understand the advice given, that the entire interior front maybe needing rebuild. I did see sag on the support structure for the bed, but also it was so lightly constructed it appeared that some of this was just from a pretty poor design and didn't see active rot inside, swelled wood, mold, that sort of thing.
Although he's asking $5900 I'd estimate a good offer might start with a 3 even though it has electric tongue jack, new tires, new microwave, a updated car stereo, working awning, and no dents or other damage, good interior.
However, Bed was horrible up front and bunks also sucked but kids could make do, the chipboard under the mattress had gotten wet and needed replacing. Plus the roof. Backwall of bedroom looked / felt solid as did ceiling as much as these things go. But it might be hiding damage, I know.
I do have a bore-scope sort of tool but with the insulation I doubt I'd see anything. Its a bit over-rated too in most respects but has been handy on a few things.
I wonder if someone who is not handy /or educated on such things may buy it from him (the "greater fool" theory) for a better price.
Jayco sales rep said when we wandered into a new place one time that this was the most popular model, so I guess they will keep showing up and I can be patient.
The inverse opinion is that we have an oil boom going on south of Houston and the roughnecks have been buying all the lower end trailers like crazy and the market is pretty hot, so it will take a fast draw to get one. This was best so far, but I guess I'll have to keep lookign if he's not interested in a lowball price.
My wife is not enthusiastic about another project as I seem to have as many projects as possible going at one time and we're trying to finish assembling a convertible project car that's been ongoing for years in my garage at 90% done. I'm leaning towards not even pursing it, but I was so disappointed as the roof was the last thing I checked and everything else seemed pretty decent.
There was a dirt-bag guy who was selling a dirty, poorly maintained version of this trailer that had missing air vent adjusters, rusty refrigerator, dirty oven, broken table mount, corroded sink drain, dented exterior, original looking tires that needed replacing, etc etc and he wanted $6k, and I overly politely declined to even offer, but he said he was "in the business of buying and selling" and it wouldn't last weekend.
But you never know (see greater fool theory)
If I get a wild hair and he hasn't sold it I'll take a picture.
For now I'm dam glad I had a step ladder in my vehicle to check it out!