Update on the ramp door seal. Although the door edging was poorly installed (mitering the corners would have been nice) The real problem is that on the left side the door opening is not square. At the bottom a gap of about 1/8" and at the top about 5/16". This means that the door gasket is barley even touching at the top of door frame and why I could actually see daylight in the corner.
The gap is good on the right side and along the top. So it was not a door misalignment problem.
I added a flange inside the door opening on the left side. Starting out at 1/2" and tapering down to about 1/16" This gives the gasket something to seal against from top to bottom.
This could have just been a Friday afternoon build thing and maybe your 300tq may not have the same problem. But if I would have left it it would have leaked for sure.