Hi i also intend to use my 06 truck for beach work and fishing I've just had my truck rust proofed.I usually just deflate tyres to about 18 ld for the really soft stuff and providing i dont stop i dont have any problems. On the wet sand its like driving on concrete.
Good suspension is needed,a lift kit is helpfull but you dont want to be too top heavy incase you roll over.
Winch is handy if there is nobody around to pull you out if you get stuck.
Make sure you use sand tyres and not mud tyres (mud tyres just dig you into the sand)
Please post some pics of your truck and where you go fishing i would be very interested.
I am planing on going to a place called agneswaters on the east coast of australia at the southern end of the great barrier reef in june for a week.Great fishing cant wait.
http://www.nissan.com.au/owningNissa...ks/feb2002.pdf