Had first blowout

Tubeless rubber snap-in valves allow a maximum cold tire

inflation pressure of 65 psi

and are designed for passenger car, light-duty trailer and light truck....


Tubeless snap-in valves for high-pressure applications are designed for medium and heavy-duty trucks and trailers and must be used when recommended cold tire

inflation pressures exceed 65 psi

....


High-pressure metal clamp-in valves can be used with virtually any wheel and are highly recommended for all track activities, as well as when vehicle

speeds may exceed 130 mph.

Metal clamp-in valves use a rubber grommet to seal against the wheel when their retaining nut is tightened. While metal clamp-in valve design and styling can result in retaining nuts hidden inside the wheel or visible outside, those with the retaining nut on the outside offer a practical benefit of allowing retaining nut tightness to be checked and adjusted without having to remove the tire from the wheel. Metal clamp-in valves

allow a maximum operating pressure of 200 psi

and are....

All "I" know is I put steel on all 6 of my tires. I do NOT want to ever have to go thru a blowout on a MH ever again. AND, I guess I am good to go 130 mph now! :B



Good info and pics on valve stems:
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=208