A few better pics of Ramp Truck . .
A quickie photo chop
Still taking measurements etc to figure out the best way to do this.
I do have some nice Aluminum ramps that are 14' long I will use. Probably use something like a roller on a boat trailer for guiding to store them under bed.
I cut apart a photo and moved the upper storage box down and the lower box rearward and it would fit perfect that way. I would then have to make the rest of the sides and the frame work.
Its 102" from front of existing tank to axle center line so I would add that exact amount to rear to give me exactly 17' bed.
In the 4th photo the end of bed would go up to forward edge of the aluminum ladder in pic. Should be a easy build!