We have two levels permanently installed on the tongue, one a large side-to-side level visible from the driver's seat of the tow vehicle, the other a bullseye level next to the jack. The side-to-side level has markings that more or less indicate how many lynx leveling blocks we need under the tires to even things out.
We find that the trailer is uncomfortable if it is much more than 1" out of level side to side, or the equivalent amount angle wise front to back.
Front to back level is ordinarily easier to achieve than side to side, since we can just adjust the tongue jack and (if we stay hitched) WD bars, unless the site is really bad.
The trailer has a newer fridge and we've never noticed a problem with it failing to cool because of slope.
The Cayo has a 1971 fridge and we do find that it is extremely sensitive to slope and won't cool properly if we're off by 1". Since it is a truck camper we have placed some bubble levels in the cab of the truck to help choose ideal placement on crooked sites.
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