I did find the solution.
Need to buy these to adapt.
https://nicholsmanufacturingandweldingservices.com/shop/ols/products/gm-valve-stem-for-tpms-sensor-rim-hole-size-625
Buying a new trailer that has 16" rims vs my old trailer that has 14" rims. My understanding is that the 14" rims have a 0.453" valve stem hole and the new trailer 16" rims will have 0.625" size valve stem hole.
What do I need to do to transfer the TPMS sensors to the new rims?
What does the shipping look like when you give it a fake address in a big city in Canada...does it change much? Is it just your address that is causing the issue?
Do you know anyone with a business address that you can ship to?
Of course the CAD is 0.73 of the US dollar so right there, $120 US becomes $164. Not sure where the extra $140 comes from other than a special handling fee from the shipper. There shouldn't be any duty. Sales tax of some sort too.
Do a whole tank and get back! This is not a valid test.
16 MPG I can believe because I have achieved that on I5 in CA going 71 MPH but over hundreds of miles.
Oh that's not a problem. I post many of my designs online for other people to use....I just don't try to make money off them. Cost less than $1 to make that funnel.