Steel housing fog and driving style off-road lights should be coated with
a auto paste wax to help protect from the elements. This will help protect
against rust and prolong the life of your 4x4 lights.
With chrome lights...that's about all you can do.
The colored housing lights like black, yellow, etc.you can take these
completely apart and repaint them or even paint them a different
color which makes them more durable to the elements if you do this when needed.
These are just a few of my tips for off-road 4x4 type lamps.
Put these with any ideas you have and make your truck lights
hold up against the harsh enviroment.
Come on in to my eBay store and look around for off-road lights
and light bars and other lighting accessories.