I have a 2 1 1/2 ton GMC trucks and since my dad passed away I don't need both of them anymore. They are both setup for welding/mechanic trucks. What I am wanting to do with one of them is I have a suburban that is the same body style that I would like to mate to the frame and have it for tow rig duties. It would have the front clip and front half of the original cab then the rest would be suburban. My question is what do I register it as at the DMV, the 1 1/2 ton or the suburban? They are very different in tag prices and registration fees. I If it matters any I live in AL.