Thinking about building a new truck, a full size legal class 8. have already built a Ranger, 1450 class. now we are thinking about making it fully legal. We are Ford guys so that is what we want to build. What year frames are the best to start with. Also, we are I beam lovers, keep this in mind. ive heard that 80-81 short bed frames are good, but dont know if that meant f150 or f250. thanks in advance for any info.