D DAY Heavy Weapon Platform

[LK-13]

consider deep cranking marine batteries.
longer life, better duty cycle, made for frequent full charge/discharge
then add solar charging plates from you local auto supply store / RV dealer.
they wont fully recharge you on the fly, but you can extend your range by as much as 15 or 20%

[ta2maki]

It has a motor on it and the air tanks are just fill stations not really remote kit I would think... Correct me if I am wrong

The output is regulated, so it wouldn't be optimal to use them for filling other tanks.

Not sure of the terrain you will be using this over or what is still going to be placed on this, but it looks too back heavy. I think you should put more weight over the drive wheels. The way it is now, you are going to have a tough time pushing this up a dirt hill.