Bed length diff from reg cab dually?

[Psycho Mythic]

I want to take a single cab cummins dually and change the rear end to be a single wheel and swap beds to make a RCSB 2wd cummins truck. My question is will the beds match up or do reg. cab duallies all have longer beds?

 

[FATJACK]

Yes...

 

[FATJACK]

They do have...

 

[FATJACK]

Longer beds...

 

[Psycho Mythic]

Lol wtf?

Looks like Imma haveto shorten the frame to do what I want :-/