Make sure you learn and really understand the local and federal wieght laws. Know your total bridge combination, different axle configurations, total gross, etc. Find a local scale and get to know them.
We had a almost full load of Ash logs the other day. With the tag down we we over 1800 on the federal bridge, but within the 2000 pound variance. However, the rear axles were overweight. Without the tag we were looking at a $6000 fine, with the tag we were at $1100. The good news is we know the local truck enforcer and he weighed us just for fun, so no fines.