I don't think it is possible to find valves or air hose rated for less than 250 psi. What is the gross load your tire are rated at, I know they will survive hi loads at there top press. alot better.With my 02 Avalanche I pulled a 36 foot chriscraft up a ramp and to my sons home . Total weight truck 6000 boat 15000 and trailer 4000. I got home alright but a week later first tire blows out. Broken belts. 3 days later 2nd tire broken belts. A week later 3rd tire had steel sticking out sidewall. Goodyear wranglers 265X17. Good year sold me new tires at 50% but demanded old tires be sent to factory. I guess they didn't want to start a firestone thing. Anyway size your tires for the job and keep your pressures up Regards The Rebel
