Disconnect the air lines supplying that air bag and couple them together with a compression fitting or push-in fitting. Air the trailer back up. Undo the bolts at the top and bottom of the air bag. Remove the air connections from the old air bag and install them on the new one (use some thread seal on the threads). Installation is the opposite of removal.
Five
All axles have brakes on them.
Most semi trailers have 8 wheels, some have 12. The tractors almost all have 10 wheels but some of them have 14.
Gross 52,000 lbs
Two per axle.
A trailer with 10' California spread can have 40,000 on the trailer axles without requiring a permit.
A multi axle truck, refers in most occurrences, to a type of trailer that is being pulled behind a semi. In some instances a semi may be pulling one trailer behind it and other times it may be pulling two trailers. On each trailer there are two axles which attach to the tires. So if you see a sign that says $.50/axle and a semi truck is pulling a trailer, he will have to pay two dollars. One dollar for his own semi truck which has two axles and another dollar for the trailer that he is hauling.
From the center of steer axle to center of rear axle on trailer. If you want just the truck it's the center of steer axle to center of rear drive axle.
Mini trucking? That's a new one on me. You might be thinking of what's referred to as "hotshot" trucking, which is a single axle trucking pulling a multi-axle trailer. This can be anything from a one ton pickup pulling a gooseneck trailer up to a single axle tractor-trailer power unit pulling a semi trailer.
34,000 on both the drives and tandems... 12,000 on the steers, with a gross weight of 80,000
ABOUT 23,000 LBS ABOUT 23,000 LBS
4/32 on steer axle.2/32 on all others