I use a Pelican Stealthlight. It sits in its charger on the rearward side of the 5sp floor console. I couldn't put it under the seat because that is where I put my fire extinguisher. I also like that location because that same light, is the one I use on my fire helmet. 15,000 CP and over two hours of continuous use (I replaced the NiCads with NiMh). And it chargers full in 3-4 hours off of the truck. So it is always ready. Great light.
The plastic case is kind of a drag. I've melted one already. They replaced it free of charge (it still worked but they insisted). They also sent me one of the new stainless steel helmet holders, sans charge. Since I melted the original plastic holder too. Mag lights corrode under those extreme conditions. But the plastic doesn't.
Mag lights are great. I own three. But I use the stealthlight the most.
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1999 2500 ISB QC SLT (No Leather!), 4x4, 5sp, 4:10, 275 inj. , 4"exhaust, Poweredge, Pac-Brake, A-Pillar gauge pod w/boost and pyro, Line-X, V-1, lights, siren, lic. plt. frame that says "Diesel Fumes Make Me Horny!", and much more goofy stuff. (Too much to be listed. )