What extras should I insist on in a new Class C

Everybody forgot long solid metal valve stems for all six tires that permit easy air pressure checks and topping off air in tires. May have to buy online and have installed by a truck tire shop.Not cheap but worth it. BTW, RV tires are not rotated like passenger tires.

Do not buy cheap screw-on "extenders", they may leak and cause tire failure

http://www.ridgecrest.ca.us/~tire-man/

http://www.borgtiresupply.com/owner/duallyvalve.pdf