What size?

[jmag86]

I currently have a 5 gallon tank with dual dc7500 and 8 3/8 asco valves on my 86 c10. My question is do I next a bigger tank ? When I am aired all the way out and my air tank full it won't pick up the front all of the way up. It will kick the compressors back on when it only picks the front up like half way. Can y'all tell me why? And does anyone run dual 5 gallon tanks with dual compressors that can post a pic??