Leveling systems

[bobofthenorth]

If you are leveling with blocks, can you block just one of the dual wheels or much you do both.

I generally block both wheels - sort of - but you certainly don't need to.  People worry about holding the whole load on one tire but those worries are silly, IMHO.  The static load from sitting with all the weight supported on one tire of a dual group is still a fraction of the dynamic load those tires face every day on the road.