Quick update . . . This morning I checked the suspect tire and it was flat (again). So, there must be something going on. Soapy water has not revealed anything . . . So, I have the tire in a dunk tank, looking for bubbles.
In my previous post where I mentioned I had the same problem and it turned out to be the valve stem I should have said it was the valve itself. Make sure you submerge the entire valve stem.
Your post reminded me to check the tire pressure on my two trailers., as it approaches time to pull 'em. The speedboat trailer had 50PSI and called for 80PSI. I filled it. The 21 footer tandem trailer was fine at near 50PSI.
I also was inspired to spray the rusty parts of the trailer with cold galv paint.
The disc brakes still bind the calipers, due to rust, but they will loosen up, as I pull it. Cast iron rotors are not good in the maritime, but they are cheaper than aluminum.
When I was a kid my Dad used to tow the family boat (20') at 80mph and the only issue was he kept frying the FMX auto trans , apparently they wernt up to much ....the trans I mean .
I always use a TPMS on trailers. With my 2024 GMD 2500 Denali, I have the trailer TPMS integrated with my vehicle. For my boats , I uses a TST 507 system. Can save LOTS of damage.
I keep a number of pressure gages in my garage and barn, always one handy to check pressures before heading out. Just part of my getting ready to go routine. Once the trailer is pulled out if my barn, I do a walk around to check lights, be sure safety chains are connected, coupler locked and tire pressure checked.
