I just bought a Trail Lite B+ 211s with 8.1 Chevy engine. This is my fifth motorhome (others range from an old 20' Vagabond, and three Winnegagos, from 19 to 32'. This vehicle is fantastic. I am...
"We had the extentions put on the dual tires. They do loose air pressure easily. We have to put air in the tires every 2 weeks before we travel."
You might want to try putting loc-tite on tire valve threads and then screw on the valve extensions. The loc-tite has kept my valve extenders in place, and they don't leak air.