Put one in my '06 2500HD Crew Cab Std bed; Fairly easy R & R, good instructions. Only issues I've had is variations in the fuel level gauge(especially parking on grades), some issues with fuel starvation in the tank @ 1/4 tank full or less.(raised the front of the tank by moving hanger strap towards rear a little), and the topping off the tank issues with getting the air pockets in the top of the tank to evac while filling. Considering installing a sump and an external pump which may help with fuel starvation at low tank levels. Other than those small issues, I'm VERY happy with the tank, especially being able to tow/drive for twice as long between fills. Can't believe GM installed a puny 26 gal tank in that ruck in first place!