Thought I would share some info after my experimenting. I had this TPMS on my TT, which works pretty well.
https://eezrvproducts.com/ I decided to use another 6 of them for my dually 3500.
I bought the 45 degree and flow through valve extensions found here:
https://eezrvproducts.com/shop?olsPage=products On the front tires and outside rears I used the "anti theft" sensors with the "flow through" extensions. I attached these to my oem valve stems (being careful not to over tighten them) with Loctite and they have worked well. For the rear inside tires I used the "45 degree" valve stems with the "flow through" sensors. I attached them the same way but they will swivel, they are designed to be able to move. These have been a problem because when they move, or you move them to add air, they loosen eventually and develop a slow leak. The solution to this I believe is to drill a small hole and use a set screw to tighten to the oem valve stem. This would allow it to swivel while preventing loosening. That's when I started looking around to see what else was available.
Found this system which uses oem style hardware.
https://dillaircontrols.com/dill/cat.../trailer-tpms/
If I were starting fresh this is what I probably would use.
Also found these valve stems which I may use for the inside rears. Also would work without TPMS of course.
https://www.shinyrv.com/product-cate...y-valve-stems/
Hope this helps someone possibly save some time and aggravation.