Two per axle.
43
9
18, The truck has 10, the trailer has 8, = 18.
30
The amount of tons a Mac truck can carry will depend on the size of the truck. A six wheel Mac truck with a dump can carry up to 30 tons or more. A Mac truck with 18 wheels and a semi trailer can carry up to 23 tons in the trailer.
That sounds like an old joke but you should be able to hitch up a utility trailer to a flatbed truck with just one or two people.
3.5
This depends on several factors. How big the truck and trailer are. How old is the truck. New trucks are more energy efficiant. Is the trailer loaded or empty. If loaded how many horses are being trailered. Newer trucks pulling trailers get about 17 to 22 miles per gallon.
Many truck accessories stores are found in Austin, Texas. Some of the stores are Custom Truck Outfitters, Advanced Auto Parts, and Texas Truck and Trailer.
It really depends on what size trailer you are interested, if it is something that can be towed behind a pickup truck, or are you looking for a large trailer for a semi truck, also whether you are looking for an open trailer or an enclosed trailer. Most Metropolitan areas might have local trailer manufacturers, if looking online, I would recommend Big Tex trailers, www.bigtextrailers.com
Air brakes are located in the front of a truck or trailer. There are many parts to an air brake. If you suspect a problem, you need to take your truck to get fixed.
the length ot the truck depends on the length of the trator and the lengthof the trailer usually tho the tanker trailer is 48 feet, and a tractor is about 20 to 25 feet so average length is usually about 70 feet