Well, that all depends on the trailer. With a Freightliner and an aluminum 48' flatbed trailer, I've always been able to haul in the vicinity of 48,000 lbs. on the trailer.
"Cattle and stock trailers come in a rage of sizes, from single animal units that can be hitched to a pickup truck, to large semi-trailers that can carry many animals at once."
I'm not sure what a semi-trailer is, but I would imagine a tow truck could help with your problem.
Depends greatly on the configuration of the truck and trailer but average cargo capacity is about 42,000 lbs or 4050 cubic feet.
The average semi trailer costs about 10 thousand dollars on today's market. This is due to the increased amount of people who want start their career as truck drivers.
An average semi 'tractor' is about 30 feet long.
11 gallons, give or take.
The power unit itself will be 96 inches at the most. In the US, trailers can be 102 inches wide.
The type of tractor trailer that can hold the heaviest loads is a Semi-Trailer truck. This is the heaviest truck that is allowed on the roads.
better y=to use it
The average fuel economy of a semi truck is between 5 and 7 mpg when loaded.
Average is 70 feet
Both power units and trailers come in many lengths. Bear in mind, a semi-trailer is simply a trailer which does not wholly support its own weight - thus, boat trailers, equipment trailers, etc. are semi trailers. But, for the sake of argument, we'll assume you're referring to a semi-trailer of the type intended to be pulled by a Class 8 truck and a Class 8 truck. Again, both come in varying lengths. Most commonly, 48 and 53 ft. trailers are seen, with a power unit which has a wheelbase between 220 and 270 inches (for a sleeper berth tractor). So you'd be looking at between 65 and 77 feet - some combinations are longer, some are shorter - but this is the "norm".