I really like the Redarc Tow Pro Liberty part # RED52VR as it's proportional like you mentioned, is compatible with vehicles that have air brakes, and it only puts a small knob on the dash of the vehicle. view full answer...
The Replacement Wooden Toilet Seat with Slow Close Lid for Dometic Part-Timer RV Toilets - Tan # DOM23FR measures 15-1/2" long and 14-3/8" wide. view full answer...