We recently purchased the TST 507 TPMS for our Cougar. The 507 saved our vacation to Grand Canyon by alerting us to a wheel getting hot. Turns out our brake controller was misadjusted and one wheel had the brake activated. Knowing there was a problem allowed us to pull over, diagnose the problem, make a simple fix and continue on with our trip knowing we could count on the 507 to alert us of any issues.
Here is link to Great RV Products. Owned by an RVer with very fair pricing.
http://shop.greatrvproducts.com/cate...?categoryId=29