[iamnotahippee]

So, the next portion, I have to be able to get into and out of peoples yards to deliver the buildings, thus loading them on the truck itself when possible. Sometimes I will haul the building on the trailer and then pull it onto the truck to set the building. Plus going to a tractor like that puts us in another class with DOT and our requirements go crazy. I have a CDL so I can legally drive one, but once get a rig that grosses over 26k things get alot more difficult and expensive. Now at some point we may go to a tractor for hauling our buildings from our manufacturer, but it is overkill on almost all of our deliveries.
The flat deck trailer, while not the best aero option, is the best business option. On a low boy with the axles up and behind the load, you greatly reduce capacity. Trailer length is limited by DOT to 53' without needing a permit every time you have it on the road. So with the axles set up like that you loose that much footage of carrying, unless a smaller building could be set on top of them. The other manipulation the flat deck allows is rear overhang. You can put over 50' of buildings on a 50' trailer because, depending on the building size, you could run with 6-8' of rear overhang.
My primary thought still lies with what I can do to improve empty, unloaded mileage on the pulling unit itself.