Nice build!! My vote is four wheel conversion but I am biased.
I have been tossing around the idea of eventually having a flatbed/dump truck. I am building a K30 at the moment and going to just be a flatbed for now. I have family up in the Ely area. I will have to keep my eyes peeled for your trucks if I am up in the area. If interested check out my build in the 4x4 section called Big Bird. Keep up the good work!!