The extruded aluminum floor is straight.
The factory D-Ring placement is not exact.
Trust me, I just drilled and counter-sunk
~70+ holes to mount (6) Mac's E-track with arrow heads and had a nightmare to align things, in line with all of their (D-Ring) placement. I wanted to align things asthetically and it was a fookin nightmare.
Advice...get under the trailer and line-up everything! Give yourself room to back-plate the track. F-their placement of D-Rings and give yourself room to back-plate and through-bolt everything!
Trust me on this one...
Posting pix on this site is a PIA. e-me if you want detail or we can talk real time...pix are easier on google or whatever.
Needless to say, think ahead and you will be much better off...