The BigRed valves also arent as fast as some of the others out there. Now you can have 1 valve per bag and do both movements, its called a "3 way".. GC makes a 3 way 450psi valve for 150 each.
The little individual valves are generally diaphram valves. You can go with 2 for the front, 2 for the back, but you will get air transfer from side to side and your truck will sway at high speeds. Def doesnt feel safe when driving.
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-Bobby-
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