from the centre of the axle to one side x2
A few trailer spindles bolted on to the axle but most spindles are welded to the axle.
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.
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 ten foot spread axle trailer is allowed 20,000 lbs. per axle, for a total of 40,000 lbs.
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.
To determine the weight capacity of your trailer axle, check the manufacturer's specifications, which are often found on a label or sticker located on the axle itself or in the owner's manual. You can also look for the axle's identification number to find detailed information online. Additionally, consider the trailer's Gross Vehicle Weight Rating (GVWR), as it should not exceed the combined capacity of all axles. For an exact assessment, consulting with a professional or referring to the trailer's documentation is recommended.
Of course it does. If you think it is close, go to a truck stop with a scale A: weigh your whole rig (all 3 axles on the scale), B: just the rear axle of the vehicle and the trailer C: just the trailer axle. D: Remove the trailer and weigh your towing vehicle. Calculate: E: The loaded trailer ( A minus D) should not exceed the towing capacity rating for the vehicle or the weight rating for the trailer. The load on your rear axle with the trailer (B minus E) should not exceed the weight rating for that axle THIS IS VERY IMPORTANT: have you ever seen trailers swaying on the highway? this is very dangerous. Your trailer tung weight - the weight on the hitch (E minus C) , should be about 15% of the weight of the trailer. That bumber cannot exceed the weight rating of the hitch, but if it is too small the trailer can be very difficult to control.
There's no bike that needs a trailer. but maybe your question is about what type of bike that you can attach a bike trailer to? I'd say go for a rigid MTB. They have the gears to allow you to pull a trailer, and sturdy brakes to give OK stopping even with the trailer pushing. Disclaimer: I can't make out exactly how the trailer attaches to the bike. Can be that an extra long rear axle is needed. If you have a q/r axle the trailer supplier can deal with that easily by supplying an extra long skewer. If you have a solid axle at just the right length it might be more awkard.
From the bottom of the frame, to the center of the axle housing, it is suppose to be 8¾" without a trailer. With the trailer, the measurement should be 8½"
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.
To help with steering, a boat should be properly balanced on the trailer, with the weight evenly distributed from front to back and side to side. The boat's center of gravity should align with the trailer's axle to prevent swaying during transport. Additionally, heavier equipment should be placed closer to the trailer’s axle to maintain stability and improve handling while towing. Proper tie-downs and secure positioning of equipment will further enhance safety and steering control.