Here is a little something that I discovered while doing strand today. Its not much but every little bit helps.
For Defense:
While you are waiting for the game to start go ahead and make your way towards the shore. Right when the game "begins" (while opposing faction is getting out of ships) the vehicles become vulnerable to dmg.
Start attacking before vehicles before they get in them. With just 2 people u can get one vehicle down to 50% before it even moves.
Like I said, I know its not much. Buts something I have noticed not a lot of people do, so, ya. Just thought I would share.
Have a nice day.