Many people argue that a Kenworth is the best semi trailer, with a Mack, following a close second. The downside being that the Kenworth is considerably more expensive.
No, the trailers don't have to.
form_title= Semi Trailers form_header= Haul all you can with a semi trailer. What size semi trailer do you need?*= _  Have you ever driven a vehicle this size?*= () Yes () No What will you need the trailer for?*= _ 
Most trailers are semi trailers. You're probably asking the difference between a semi trailer and a full trailer. A semi trailer is not wholly self supporting, and weight is distributed both the trailer axles, and to the tow vehicle. A full trailer supports its own weight fully.
form_title= Semi Trailers for Sale form_header= Purchase a semi trailer. What size semi trailer do you need?*= _  Have you ever driven a vehicle this size?*= () Yes () No What will you need the trailer for?*= _ 
You can find used semi trailers on the following site: http://usedsemitrailers.com/. You can save a lot of money.
A semi-trailer is distinguished from other types of trailers by having no front axle. Semi-trailers are used to transport large quantities of goods over many hundreds of miles.
Many businesses sell new or used semi trailers. I suggest you to look for these different type of businesses and see which best fits your style when buying a semi trailer.
CBs as in CB radios used by drivers of Semi trailers
Piggybacking is a term for transporting semi-trailers on train rail flatcars. The trains can then carry numerous semi-trailers to various destinations to reduce transportation cost.
The power unit itself will be 96 inches at the most. In the US, trailers can be 102 inches wide.
It's short for "semi-articulated"