op says wrote:
Obviously going from a st225/75/15 load c to a load e is better than nothing correct?
A trailer can have too much tire unlike a truck. Too much tire and you can't use 80 psi pressure so you have to derate the tire. You gain nothing but a softer sidewall and a hotter operating tire.
Apparently your trailer came OEM with ST225/75-15 C load range.
Maxxis LT U-168 is a commercial grade tire with a LT235/75-15 D load range at 2337 lbs. Another 225/70R15C at 65 psi and 2469 lb capacity. These tires have became popular with all types of trailer owners where they can find them (not just RVs).
Vanco 2 from Continental another popular tire for trailer users has a 225/70R15C all position tire rated at 2470 lbs at 65 psi.
Do your home work on all the numbers.
"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers
'03 2500 QC Dodge/Cummins HO 3.73 6 speed manual Jacobs Westach
'97 Park Avanue 28' 5er 11200 two slides