Based on my May tour of the NRC factory I would hope that the infloor heating on a NRC would have better floor insulation. Otherwise you will loose a lot of heat under the floor.

I would have to check my notes but from memory they use a 2" x 2" steel tubing in the floor frame. I think it was 24" oc and they insulated it with beadboard. However the panels were not fitted very well. They simply just slipped the panel in the opening. Several times I could see gaps around the side edges. In one spot I remember being able to slide my fingers between the beadboard panel and the framing. I don't have small hands. Unfortunately this type of quality control is common in the RV industry in regards to insulation.

NRC uses spun fiberglass for wall insulation. Their wall framing is one inch steel tubing, either square tubing or hat tubing depending on the area. Inside to the tubing is a OSB panel. Steel skin held by adhesive on the outside of the steel framing.