This is why you don't use an extended cab bed on a std cab

Long bed frames and Cab Plus frames are the same. Just have different fuel tanks, and rear cab mount locations.

besides, I have a real long bed, it's on my trailer. And I found another long bed at my local junkyard. Its a bit beat up though. I have a picture of a long bed sitting on the frame somewhere, that won't work either because of the tire. On my build, it won't work because the rear IRS brought the wheels up even closer to the cab.