e.g. a CAT D8T bulldozer weighs in at over 80,000lbs all on its own and they are often trucked around as a complete unit, so you're looking at 20-35,000 more for the trailer and tractor to haul it. Heavier pieces of equipment like D9's (108,000#) or D10's (145,000#) are generally 2-3 loads of chassis/tracks/blade&attachments.

Apparently the highway patrol would camp out in the industrial/shipping areas and watch for compressed suspensions/bulging tire sidewalls on big trucks as a monthly fundraising exercise.

Obviously there's a business incentive to move as much as you possibly can at once...