Very common among all manufacturers, with or without slides. Never is a square or level put on a unit during assembly. It's never going to be perfectly square or level. Heck our sidewall in our Forester wasn't square with the floor. I wouldn't worry. If you want to satisfy your curiosity, take a square and a level to a dealer lot. Or, better yet, head over to Indiana and take a factory tour.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.