My conversion post may help. See here
ST225/75R15 to LT225/75R16 ConversionIn my case, I picked BFG Goodrich LT225/75R16 LR E All season Commercial truck tires. I am due to change them soon, not due to wear, but age. I have had excellent results with these and I'm glad I did the upgrade.
I bought Dexstar rims from Etrailer. They were made in the USA and still where a year ago when I bought smaller rims for my other camper. They are a quality trailer tire rim. Most nowadays are offshore ones and the tire stem hole is P poor.
While you are doing the new rims, consider putting metal valve stems in now in case you choose to add a TPM system. If not metal stems and no TPM, then at least get high pressure snap in's.
Those 4,400# axles are a red flag for me. They gave you over 10,000# of ST tires (even if junk tires) buy they stopped short in the axle tubes? The springs I'm sure match them. What is the GVWR of the camper?
Hope this helps
John
