300 pounds
header board is a the board on the front of the trailer, or the board that is on the tractor behind the cab/sleeper. this is made of metal and is to prevent the load on trailer coming thru the cab in the event an accident or other emergency
The biggest you can get is: Cab: 160 inch Sleeper Trailer 53 feet 102 iches 14 feet
They vary, but I think the avg woube about 19,000lbs.
You're probably referring to some sort of sleeper cab truck. You might be referring to the ICT sleepers.
It functions the same as any other automotive air conditioning system, albeit a sleeper cab tractor will typically have a second compressor for the air conditioning system in the sleeper.
semi cab
day cab is a truck with no sleeper, just a standard cab
Cowtown Sleepers can make a sleeper cab for any truck out there.
This varies greatly depending on the type of truck. For example, a sleeper tractor weighs more than a day cab, a refrigerated van trailer weighs significantly more than a flatbed trailer, and so on. I drive a tandem axle day cab Sterling semi (this is a semi tractor with a total of 3 axles and no sleeper), and I pull a 53-foot dry van trailer (this is a box trailer without a refrigeration unit). When I have run it across a scale empty with about 120 gallons of fuel (this will also change weight as fuel weighs about 12 pounds per gallon), the whole truck weighs very close to 29,600 pounds. An empty semi can weigh as much as about 40,000 pounds, leaving room for 40,000 more of cargo before reaching maximum legal weight of 80,000.
A bobtail truck is a truck that is not carrying anything. It has no trailer or chassis connected. It is usually the tractor part of a semi truck without the trailer. It can also refer to a truck where all of the axles are connected to the same chassis.
A store that sells a tractor cab is Sears. For example under the topics Lawn and Garden and Tractor attachments, listed is a Craftsman brand Tractor Cab.