Outer Limits 4x4 Board

Hi I have an 2002 twin cab lux and was interested in swapping the style side for a tray mainly for transporting trail bikes.
I was just wondering what the standard tray size for a twin cab was as if it was too short I may need to get somthing custom to get it long enough to get a bike on straight. I know the single cab trays are ample but the length clearly would be way too long.
Any input would be great.

Cheers.

I fit two bikes on the back of my tub on my 03 lux no probs at all

I just dont like the wheels on the tail gate and would rather shut the rear gate to enclose the tray just so I can still put stuff in there. I would rather a tray too for work reasons also.