Well, just using long side plates and through bolting them wouldn't provide the strength and rigidity on the frame I would trust. In the commercial market, frames are always welded when extended or shortened, with additional welded side plates at least on one side of each frame rail.
That's my opinion . . .
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Highway OPie (Speed Gray) Grand Rapids, MI: 2003 Peterbilt 379 Motorhome; 550 hp 6NZ Caterpillar C15, Eaton-Fuller 18 speed transmission, 3.36 rear; 63" sleeper and 16' Morgan box.(highwayopie@aol.com). There are many Peterbilts, but this one is mine!
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