MOST IMPORTANTLY:
1) Any size load can be moved safely with only one limitation- SPEED
2) GVWR's & GCWR's can be legally exceeded, with additional requirements.
3) The FMCSA is the tier 1 regulator of heavy vehicles.
Federal Motor Carrier Safety Administration
4) To be legal over 26,000 pounts, interstate, you need a CDL.
5) It is possible to exceed legal limits and still be safe.
-more to come