Leveling a trailer with tandem Torsion Axles

I would think that's level enough, although I rather doubt there's any very consistent standard for angle vs. bubble position vs. the lines on levels. Basically, if it seems level when you're in the trailer (that is, the cabinet door behave normally, the coffee or tea in your cup isn't slanted, the eggs don't all slide to one edge of the frypan, the water in the shower drains rather than pooling up in a corner, and so forth), then it's fine for the fridge. With a four foot level, a one degree angle means you'd have to raise the low end by a bit less than an inch to achieve level. (You can figure out the exact amount using more trig if you really wish!)

Many, including myself many times, are far more precise than is actually necessary.