The wire on the rear wiper switch seems thin I dont think its a good idea going there.
The trailering wires wont work either.
There is a heavy wire that will work on the blower switch , But its only powered up with key foward(truck running) it is not powered when on accessory or key out position.This one might be the best because it will only power fridge when running.If im at a drive in with the radio on for a few hours the fridge wont run so less chance off battery going dead.The manual on fridge says you can unplug and it will stay cold for a few hours so I think this is the easyist way and most practical. 
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H3 gray adventure,brushguard,hood handles,sunroof,steps,crossbows,smokers package,window/sunroof visor,Airbrushed spare tire cover,mudflaps,K&N filter,SS Hummer insert,Hummer rubber mats,cargo rubber mat + shade,12 volt airhorn,eclipse nav/dvd/rear camera/mini remote,autostart,12 volt fridge,high beam garage remote,underhood air compressor, taillight bezels ,clinometer ,trailer brake and hitch.
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