No RVIA sticker on 2012 Nexus 24P

hpdrver wrote:
So unless someone can provide me a US law that governs the house portion of RV's, the RVIA sticker is nice to have but not mandated by law. If there is a law, it should state that the RV must comply with these standards that are not motor vehicle related.

Well, since you asked nicely, (and pardon the CAPS, it's the way the State of Texas codes their website) TITLE 14. REGULATION OF MOTOR VEHICLES AND TRANSPORTATION, SUBTITLE A. REGULATIONS RELATED TO MOTOR VEHICLES defines a Motorhome in the following way;

"(21) "Motor home" means a motor vehicle that is designed to provide temporary living quarters and that:
(A) is built on a motor vehicle chassis as an integral part of or a permanent attachment to the chassis; and
(B) contains at least four of the following independent life support systems that are permanently installed and designed to be removed only for repair or replacement and that meet the standards of the American National Standards Institute, Standards for Recreational Vehicles:
(i) a cooking facility with an on-board fuel source;
(ii) a gas or electric refrigerator;
(iii) a toilet with exterior evacuation;
(iv) a heating or air conditioning system with an on-board power or fuel source separate from the vehicle engine;
(v) a potable water supply system that includes at least a sink, a faucet, and a water tank with an exterior service supply connection; or
(vi) a 110-125 volt electric power supply."

Note the words in para. (21) (B), "and meet the standards".

You cannot just throw something together and sell it to the public as a roadworthy vehicle with safe living quarters. It must meet certain minimum safety standards.