Body length compared to chassis

[VaultBoy]

So ive poured over the current rules, and i cannot find an answer. How long does the body have to be compared the the length of the chassis? Say the chassis is 12" long, how long does the body need to be? Can I have a 1 piece truck body with part of the back cut off or not?

 

[MOguy]

So ive poured over the current rules, and i cannot find an answer. How long does the body have to be compared the the length of the chassis? Say the chassis is 12" long, how long does the body need to be? Can I have a 1 piece truck body with part of the back cut off or not?

I believe the body has certain height and width requirements and has to cover electronics but that is it. This question came up on a SORRCA Facebook page and apparently some thought you need to cover the entire chassis, but you don't. The question was directly about cab only and apparently a bed is not needed but it is good for scale points.