My waste water tanks are 4 1/2 inches high curb side & I believe 6 1/2 high on the driver's side, or tapered as you said. The aftermarket supplier wants an internal slope toward the drain & instructs the top of the tank to be level. The bottom will then have the proper pitch.
You realize, if you tip the tank so much to get a reliable reading, either the MH will fall over or you'll slide off the toilet... Ha Ha Ha, am I the only one laughing at that picture?
I would have gone to the trouble of calibrating my readings when the unit was new, if I had known about the inaccuracy. Now that they've been used, I think I'll skip it. Don't really feel like messing around filling & emptying my tanks at a dump station.
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