If all you have in the seat box is a battery and you have good connectors it doesn't need to be water tight. Obviously you don't want it holding water (so there's an argument for not making it water tight) but submersing the battery won't hurt anything.
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic