Nebraske Coyote Hunter, the magnalight we use isn't a cordless light. On their website the one you need to look at is the 100 wat halogen spot/flood combo with the 12 vt plug and cord.
Catman2, as far as any kind of technique for being able to hunt from a truck the best advice I could give you is to keep your light going all the time. If you already do this than you are on the rite track. You had mentioned you were worried about the noise level of your pickup in a smaller place, well the only thing I can say is just get in as quiet as possible, dont slam doors, dont talk, and preferrably use the quietest truck you have access to. 90 percent of our country is composed of small plots of land rarely bigger than 500 acres per spot. Some are as small as 50 acres. We get told all the time that the coyotes in my ares are different then those west Texas coyotes you guys are hunting, lol. Well that couldnt be further from reality, cause the majority of the areas we hunt are very pressured and have other hunters calling all the time. There have been several refrences to the dogs in west Texas and all of them are true no doubt, but the rules of west Texas are a complete 180 from the terrain and coyotes we hunt around here and the tecniques I have mentioned in this thread have worked far better than anything else we have used in the past. The point I'm really trying to make is, if we can get it to work around here, than it will work anywere! Try the truck. Get in the bed and have you a light guy and a shotgun and a rifle and a pair of shootin sticks and your set. Also put two batteries back there and hook them up in parralell, pos to pos, negative to negative, and use the pos of one battery and the negative of the other battery to hook up you lead wires to your spotlight and you will still have 12 volts. This will draw less amps per battery giving you as much juice as you will ever need.Plus the dimmer will be on appx. 20 percent compacity about 95 percent of the time so this will greatly increase the lifespan of your battery as well. You should never run out of power this way. Give it a try and if you need anymore help dont hesitate to ask. Good luck and good huntn chris.