frame shorting Ques.?

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Okay everone. woke up this morning and had an idea! had to get coffee in me first but anywayz, i have 2 long beds one a 70 chev and one a 72 GMC . im thinking that i have 2 frames and i could shorten one to a short wheel base (always wanted one). but my question is can i use the trailing arms of my long bed after i shorten the frame? iknow the procedure on shorting the frame but i don't know if i can use these trailing arms . any help will of course help, and also i would need a one piece drive shaft right.? any info would be great