I ve got one of Tricks. Its pretty badass made out of SS. Don't use aluminum with meth, It will eat thru it. Mine holds right around 2 gallons.

 

Trick actuall can make you one any size. Im sure he can make one that looks like a tool box and holds 55 gallons, lol. That way you won't run out and always have traction.

 

Couple of things to look at is where you are planning on mounting. If in another sealed type compartment, make sure its vented to the outside air. Otherwise you could have one bad day.. If mounting in the engine compartment, that is not sealed and will be fine. If your pump is having troubles pushing the fuel forward any length the pump sucks and should be thrown away. The suction side should be what you worry most about. Most pumps have a problem with suction UP hill so keep your pump lower then your supply and it should be fine.
2gallons of meth will last a really long time as long as your fuel system is doing its job.