Roll 1 or 2 of them out of the Dropship, park them next to the Dropship, and you have a decent firebase. Very slow, but if you don't need them to go fast that isn't an issue.
Or just park them at a firebase for whoever wants to stop by and try to raid. Figure out where an attacker wants to raid, plan a firebase nearby, taking into account locations that are good for Dropships to land but hard for a defending force to get there easily.
ICE means it would be easy for lower tech levels to maintain, and having a 50-ton trailer just for towing spare ammo means it can be very annoying for a long time. Or it can tow other things too.