TST 507 as well and I used to use it on my dolly tires and on the car's rear tires. Be certain to get the dolly valve stems changed to metals ones. I provided the valve stems and the local tire shop charged me just under $20 per tire to dismount, replace the valve stem, and remount.
I calculated my 12" dolly wheel speed at 65 and it was around 2,000 revs per mile. Adding even the 0.6 ounce cap sensor to the end of the dolly rubber valve stem (essentially now a lever) is going to bend that rubber valve stem. You do not want the system you installed to detect
a flat to actually cause
I used TR 416 valve stems. They come with two gaskets for different sized wheel holes. That confused two tire shops. Each shop thought one gasket went on the inside and one on the outside. No, one gasket on the inside and the metal washer on the outside.