I have the exact one you ask about... . worth the extra IMHO
fit and finish is by far the best out there. . I looked at several brands before I spent the extra $$ also . . mine is the 54 gal one with box... you will only get 50 gals in it [or that is what the gauge says]... first fill up I did get in 53. 5 gals though... 1200 miles without a fill-up is the best
PS. . Don't know about the tank only issue. . they are in Chico,Ca... . give'em a call