Glen,
Yes, the HitchHiker 31. 5 LKTG was built on a Young's Frame and should be a very good used trailer. You should be able to find a Young's Frame tag or stamp on the kingpin box identifying the frame as built by Young's Frame but whether you find it or not, it was built on a substantial Young's Frame. All DA 31. 5/32/327 trailers were built on a Young's Frame. I
That one is basically the same trailer I own and an extremely popular old floorplan built for many years including now as a 327 LKTG.
LKTG means "L" shaped kitchen and TG means triple glide.
Here's the floorplan and specs from NuWa's Website Archives:
http://www.nuwa.com/archives/
Here is the standard and optional equipment, etc.
http://www.nuwa.com/archives/
Interior Photos of various models
http://www.nuwa.com/archives/
Exterior Photos but not the 31. 5
http://www.nuwa.com/archives/
You can check the price on NADA under used RV/Fifthwheel Trailers/NuWa/Discover America/31. 5
Run the glide rooms out and climb up on the roof and check all seams where the fiberglass end caps join the roof, around openings for vent stacks, vent fans, antenna, etc. Also check for seam caulking on glide rooms. Since just before my trailer was built in May '07 they have been using a new seam tape that supposedly adheres and seals for the life of the trailer but when that one was built they were sealing seams with some other product. I've seen trailers that had been in full time use with the glide rooms out with severe wood rot in the walls and floors of the large curbside living/dining area glide room. The only cure is complete rebuild of the glide room which is expensive.
That is fundamentally a very well built and excellent value used trailer. They aren't top of the line luxury units but a very solid, well insulated, four season trailer. But don't assume it was automatically well cared for. Do your due diligence in inspecting it.
I'll be happy to answer any additional questions you may have.
I'm still well pleased with mine and recommend the trailers.