With an a frame:
The total of the "trailer" (the mini and the a frame thats mechanically fixed to the vehicle) must not exceed 750kg unless braked.
You then have your normal license rules as per the mam not exceeding 3.5 tonnes etc etc unless you have a B+E etc.
The "trailer" can have all four wheels on the road and can be untaxed and have no mot but must be fit to be towed as a trailer as per normal laws. Any vehicle can be used as a trailer provided the A frame is mechanically fixed to become one with the car and create a "trailer".
If a braking "system" is fitted on the trailer as in your four wheels have brakes then they must work and be linked to the tow vehicle regardless of weight.
This means you must remove the capability of being a brake set up to each wheel to be an "un-braked trailer".
Using a mini and A frame as a trailer, the "trailer" must have a tow board or similar and display the tow vehicles registration. the tow vehicle must be legal and you must be within the specified towing weights and braking capabilities of said tow vehicle with trailer.
There are no distance laws using this method. Ever seen a motor home with a tiny <750kg car bolted to the back? thats how they do it.
You can get a braking system to use with using an A frame if you are over the 750 kg limit. Using a braking system will also allow an increase to 85% of tow vehicle weight as long as you are still within the 3.5 tonne mam on a B license and other towing laws.
50 and 60 mph applies as above on a roads and motorways etc
This has been clarified to me by Vosa and the DVLA.
A dolly is different and must be used for recovery purposes only and as above not for A-B transport.
The best thing to do is contact those in the know and get a reply printed for when you get a tug from the dibble. I have done this and have it laminated and kept with my A frame for if I ever need to use it.
I also have the relevant sections from the .gov sites printed off and laminated for the same reasons.
I have had a police officer telling me I was breaking the law until I proved I wasn't.
The grey area to watch out for is the braking set up system on the car/each wheel. If they work or are present then they must be used. Officer discretion could be used when inspecting your braking system so be aware!
Edited by minihobbymini, 08 February 2013 - 12:20 AM.