I had TST pass thru senders on our 30' travel trailer. It is a good product and worked fine. I was not thrilled with the readout monitor which cycled each tire readout separately. It was also not easily read, by me, at a glance while driving down the road. This "new" system is a second iteration. They have apparently been making TPMS transmitters for at least 3 years in conjunction with their toad portable braking system. Their display pad is 7" and displays the numbers on all tires all the time. As far as saving money, I'm not sure I will be not be spending a bit more. I expect to have and use this product for quite awhile and, unless prohibitively more expensive, don't worry about spending a little bit more to get what I want. I haven't made up my mind yet and am looking at several systems