Why?
1)
Asymmetry. if one team had to rely on supply boats rather than supply trucks then their supply line would be at the water, which would force them to change their tactics. e.g. Bi ming could benefit from this, if the Chi had it it would be like they were being resupplied from up river, whereas the brits are controling "supply road" at the start and therefore get Trucks.
Or even a flag dynamic could be used. You only get trucks spawning at main if you have X flag, otherwise you have to make do with the boat.
2)
On river maps it would be a very fast resupply route, but fraught with danger of ambush, which is a fun dynamic if you ask me
Problems
Reloading would be a problem maybe
Patrol boats aren't quite used in this way afaik, but the lack of interest in making new boats for BF2 is quite bad, so this would have to do.
It might be a fun dynamic


RANGERS LEAD THE WAY!!!
Do not post stupid suggestions just because you had a bad round in PR 


