cali combo

So i am about to shave my whole ass end dual 10inch leds and i was wondering how far back to i go for the frame i kinda had to replace my wiring so i had a whole cut in my bed where that little step is and i was goin to go back that far but, i was inspecting it and stuff and my bed bolts are there what do i do ?

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what does ur bed bolts have to do with a cal combo?

not really understanding this one either

are you talkin about building a structual fram for the back??? cuz thats gonna go where ur tailgate is now.... if thats what ur talkin about.... you dont want to put that like a foot into ur bed