RVCG does not say anything about frames on any Hitchhiker, but the 07 HH II LS 32. 5 FKSBG is rated 4 stars and is rated for Snowbirding use.
JD Gallant of RVCG has this to say about HH:
Let's face it, the management at Nu-Wa deserves a lot of credit for building a fifth wheel that has consistently been a good value. The main reason it has maintained this reputation is that they've paid attention to detail during the construction process. They'll change when necessary -- such as when the public told them they wanted aluminum framing -- but they work hard at getting the design, materials, and workmanship just right. They use an excellent vacuum-bonding process that laminates a very strong blue foam between the skin and the interior paneling. (Yeah, believe me, there is a big difference in foam quality. Blue is the best!) Because they use this foam, they can get by with perimeter framing, thus keepng the insides warmer or cooler -- as you desire. Although I've found a few flaws when doing my roof inspections, the rubber roofs were laid down better than average. I've picked them apart for suspension deficiencies, but these were never enough to stop me from giving Nu-Wa a good grade. The construction features in the past have been very good, but have never received my 'excellent' rating. However, if the new construction process holds together as I think it will, who knows what the new way will bring to Nu-Wa.