heat is a tire killer
running at 50 psi your tires will actually run cooler than at 35 psi.
the rated load capacity of your tires is at 50 psi
if you run 35 psi then the load capacity is lower .
i upgraded my boat trailer tires from 13 inch to 14 inch .
my boat trailer is a little more bouncy but i do not care because nobody is riding in my boat going down the highway .
i tow my boat long distances in the summer , sometimes in 100 degree heat .
i upgraded because i wanted no problems getting to the lakes, rivers , and the delta .
i run the max inflation pressure listed on the sidewall .
regarding jacknifing i have owned many trailers , all types .
the principal cause of jacknifing is the trailers that have too short a difference between the trailer axles and the trailer ball .
i have owned 8 different boats since 1972 .
the remedy for jacknifing is moving the axle rearward .
my current boat trailer , i moved the axles back a foot .
my trailer will not sway even if i am going too fast down a 7 % grade in a curve with a pepsi in one hand and a sandwich in the other ...........