A ten foot spread axle trailer is allowed 20,000 lbs. per axle, for a total of 40,000 lbs.
A trailer with 10' California spread can have 40,000 on the trailer axles without requiring a permit.
With a ten foot spread, you can have up to 40,000 lbs. total on the trailer axles, but no more than 20,000 lbs on each individual axle.
A few trailer spindles bolted on to the axle but most spindles are welded to the axle.
In the UK, the maximum axle weight for a trailer axle on a 6 axle trailer is 8500 kg. In addition it must have road friendly suspension. With a 5 axle vehicle the maximum axle weight is 11.5 tonnes.
A split tandem axle is one where the axles on the trailer are several feet apart. There are 2 types of these. One set if "fixed" and cannot be moved and the other you can pull the slider pin to move them to adjust your weights so your legal. Hope this helps! (BTW if you don't know what I'm refering to this question and answer are for 18 wheelers.)
What type of truck and trailer? For all I know, you could be talking about a Ford F650 and a single axle utility trailer. If you're referring to Class 8 vehicles, something like a single axle tractor towing a single axle trailer would be allowed an interstate GVW of 52,000 lbs.
from the centre of the axle to one side x2
Five
A single axle utility trailer measures 12'x77" and a tandem axle utility trailer measures 16'x77". In the USA, a utility trailer can be no taller than 13 ft. 6 inches.
Measure from the point the trailer connects to the truck to the center of trailer axle ( if a tandem axle trailer measure to the center point between axles) multiply by 2 and this will have you close to turning radius.
A small single axle trailer does not need brakes but be aware that your vehicle will have to stop the vehicle plus the trailer, so allow more stopping distance. A double axle trailer needs trailer brakes if you are carrying a heavy load of any kind at all.