Sailun TerraMax HLT-C tires can work on Class C motorhomes if load ratings match your requirements. Verify your door placard specifications and consider actual corner weights before purchasing.
Verify your RV spare tire is correct size and properly inflated before every trip. Tire shops sometimes install wrong sizes. Check pressure regularly as spares lose air.
Find 4.25x2.25 oval dually valve stabilizers on Amazon, truck tire shops, or RV parts suppliers. Search dually valve extender kit. Crossover extension tubes are alternative that routes stem to accessible location.
Correct tire pressure for Goodyear Fuel Max RSA depends on actual axle weights not maximum rating. Weigh RV at CAT scale, use Goodyear load inflation chart to find proper PSI. Add small safety margin.