The RVIA compliance sticker is somewhat based on ANSI regulations. It lets anyone know that those standards were in place, when built. You can't buy the sticker. RVIA sells them to RV mfgs.
Also, is there a need to have this particular badge on a DIY RV? I would say no. Most DIY RV restorations or total builds go even further than what an RV mfg does. Materials are typically better and mechanical systems are installed the same, if not better.
FWIW, I replaced all of the wiring and plumbing in my trailer. I would put it up for inspection at any time. I installed a UL approved 75 amp load center and have 50 amp service. Originally, there was 30 amp switch box with three circuits. I have all new PEX plumbing with shut-off valves at every fixture. Terminating supply lines are all braided stainless steel. The drains are all ABS and are vented and sized according to typical codes. The 12V system is so above typical that there is no comparison. I spent over $200 just for the distribution panel and the switches. Propane appliances are served with mild copper from a cast iron pipe. There are valves at all appliances.
I list the above so that others can compare and decide if a DIY effort can be the same, better, or worse than something with an RVIA sticker. Also, I did leave the RVIA sticker on the exterior. If I didn't have it, there may be a service or an insurance company to inspect the systems, should I have a need for a badge or inspection sticker.
