[tentcamper]

For years I have used the 2x6 blocks for side to side. The last 3 or so years, I have used the lago blocks. We get the side to side level within 1/2 inch across the 7+ feet (1/16" per foot). Which for us is just fine and we almost never do any further leveling on the side-to-side. Maybe an extra turn or so on the low side stab.

The fridge is the key thing to be as close to level. If you operated the fridge standing still and it too much off level it can be permanently damage by developing crystals in the coolant,

So what we do, the first time with any new camper. We level the camper using the fridge. We then apply the stick on levels on the side and front of the camper so the fridge is level. Out of my 5 campers the fridge has always been at a different level then the camper.