Need heavier truck

[Lug]

I have this posted on the engine & drivetrain board. It was suggested that I post it over here. Since I don't know how to move the origonal the question is asked twice. Sorry.

I have a 67 CST K10 and have need of either a heavy 3/4 ton or 1 ton. I am wondering if it is possible to swap out the axles and springs for the 3/4 or 1 ton. As the drought continues I am considering putting a together a tank and pump on it in case the fire season gets to close for comfort. Also maybe install a dump bed to use around the green house and gardens for moving dirt and "fertilizer". Figured converting might be as easy and cheap as trying to find something similar. Will these be a doable swap? What years of axles fit under the 67?

Justin