Converting cottrell 5 car head rack to a 5 pack

Does anyone have any pictures or info on converting a 5 car cottrell head rack into a 5 pack. I may sell my trailer and convert mine. There is more to this story but for all intents and purposes let’s stick to that first sentence.

I have attached a photo of one I found on google. It is literally the same truck I have and has been converted.

 

Kind of looks like they welded the back of their trailer on to it. There are plenty of junk trailers out there I would imagine they'd be cheap enough. A good welder could make that happen easy enough.

 

Come to miami its 20 shops down here who have perfected that