How to make air tank for suspension

anyone know details in making an air tank for air ride system...I want to mount along frame rail to create room in bed of truck...any insight?

 

If your runnin a boxed tube frame make one of the frame rails an airtank. Cap the ends to create a box. This will not take up ANY space in your truck bed.

 

But it will eventually rust.

 

Homemade air tanks kill people do yourself a favor and buy one that has been certified for the pressure you are going to be running your system at!