Thanks all - the TST 507 was the other I was looking at, and he and I were just discussing the options we have for taking a vehicle with is cross country (flat towing my 2013 GMC Terrain, putting the Terrain on our car trailer, or purchasing a tow dolly and a small cheap car) so that will also dictate other factors for the TPMS.
This newb greatly appreciates your time and responses!