Steel Soldiers Supporter
Not a great location if that tire ever kicks up something big or blows out, also don’t think bolting the air dryer to the frame and the bed is going work out well...
The frames of these trucks are designed to twist/flex on uneven terrain. The beds are therefore hard-mounted using the rear anchor points and the front anchor points have LONG spring mount bolts assemblies. HOWEVER... It looks like your front mounts have already been altered to be hard-mounted also using standard bolts and not the 10-12" long suckers with the springs on the bottom!!What's the problem with bolting to the bed & frame?
The flexing of your frame/bed's interaction may have already been compromised.
By design, the bed itself does NOT flex, but the frame beneath it IS SUPPOSED TO be able to flex up to 45 degrees relative to the front/back-most frame cross-members. By bolting the front of a bed SOLID all of the flexing and twisting of the from under the bed is restricted, thus potentially damaging your bed's structure (AND your Air Dryer's mounting) should rough terrain induce those twisting forces.
I have seen both Deuces and 5-Tons with frame cracks just forward of the errant bed hard-mounts at the GOODYEAR PROVING GROUNDS here in San Angelo, Texas. They utterly rendered SIX trucks as SCRAP by hard-mounting and then torture-testing their tire products!!!
THAT is why your mounting may end up being a problem.