Hmmm all this is new to me. Sell enemy units - I assume just drive a unit there and get out?
Is there a guide on how to work this system anywhere?
No guide I know off, not much too explain anyway, get a truck load up weapons from fallen enemy units (magazines are not worth much so leave them, except AT rounds)
It would be better to use that time spent gathering weapons to taking another town, but it is a suggestion.