Actually RV construction
is required to follow the NEC.
NFPA 1192, Standard on Recreational Vehicles -
4.4 Electrical Requirements.
All electrical installations, systems, and equipment shall comply with Article 551, Parts I and III through VI, of
NFPA 70. All low-voltage electrical installations, systems, and equipment shall comply with ANSI/RVIA 12V.
I think they meet all the GFCI requirements. The bathroom, kitchen and outdoor circuits are on GFCI.
Never heard of the 15A rule for kitchens in a residence - 2014 NEC:
720.6 Receptacle Rating. Receptacles shall have a rating of not less than 15 amperes.
720.7 Receptacles Required. Receptacles of not less than 20-ampere rating shall be provided in kitchens, laundries, and other locations where portable appliances are likely to be used.
However, RVs follow different rules under Article 551 based on the rating of the incoming service. They are somewhat limited by the supply, yet have spacing between outlet restrictions, so there may be more outlets on a RV circuit than you might find in a residence. We have over 10 20A circuits in our Kitchen at home including the built in appliances. An RV supply could never support that.