Thanks for the input, all of my tanks are empty as well and yeah it could be a loading issue, I didn’t think about that. And yes the concrete was flat but maybe it wasn’t perfectly level. Either way I think I should be getting the same measurements on all 4 corners of the frame if it was perfectly level. Also I got under my TT and didn’t notice any visible cracks in any welds and all of my leaf springs and suspension as a whole looks good as well. I will take a more detailed look at it again this evening!