Hello. So we purchased a new Shasta Oasis 25rs in January 2016. The tires are 205 75 14 load range c. Constancy tires. (no doubt made in China) We drove it to Seattle and back to Salt Lake City approx...
Steel valve stems not needed unless Tire PSI 100# PLUS
Balance trailer tires.....IF it goes round and round at speed YES!!!
Upgrade from 'C' to 'D' again YES-----next year
Just keep tire pressures maintained/checked prior to travel days in AM COLD Stay under 'speed rating' of tires Most likely 65 mph) Stay under 'load rating' of tires (stamped on sidewalls)