You run into Over enthusiastic brokers all the time
They will tell shippers "Oh, it only 1300 miles. He will load Tuesday and deliver Thursday". They don't take into account that it might take all day Tuesday to load and the load sheet still says Thursday delivery.
Like GMAN said get into heavy haul/ OD and it gets worse cuz most brokers get one and don't have the faintest.
I am under a load (well my trailer is) that loaded in Del Rio Tx going just outside of LA, 16 wide, 16 high (Well, might be a little more as it is round but I forgot to allow for trailer hight when requesting the permits, by overall length 147. Although the rate the shipper gave the agent is good (and I can live with) the agent had no idea what it involved, she showed it as 4 days. Parked the trailer at the Nv. Ca. line and bobtailed back to a friends house in West Tx. till CalDot issues the permit, estimate 20 days.
Main point is two or three times a day I called the shipper and receiver and they both know to the minute what is going on and have been there before. Both have said numerouse times "We wondered how that agent figured that time frame".
KEEP IN TOUCH WITH THE SHIPPER AND RECEIVER !!!!!!! One of those is paying the bill