You might want to go with heavier axles/transfer case/transmission. GM did make a 4x4 version of the Kodiak and Topkick, which will maintain the load capacity of your 2 ton truck if you use the axles/transfer case/transmission. The automatic used in those also has a pto on it.
On Napco conversions, AD trucks and the early '55 Seconds, the pumpkin is on the left. Late '55s-'59s had it on the right.
