I like to play SBH on nod
If i got to GDI I like to play as Hotwire
I always think like a SBH ... and always defende on GDI
on a 50 slot server, you probably need 6 Hotwires constantly guarding the base ...
if you have those, and consider the close spawn after a hotwire died + those who happen to be in base
you should have a good chance to defende all base
the key is to scare the SBH, do not let them plant .. make them run around the base in fear of being uncovered
you also can use an APC to drive around the base ... (but not exit if you found the beacon)
I remember matches where i was driving an APC around the base and having a defuse team on board
BUT if you get 6 SBH to plant nukes on strategic places simultaneous, you sure found a good team!