Curiosity got the better of me so I looked up our local regs, the following is published for BC
Recreational Vehicle Towing
Brake Requirements
All trailers and towing dollies (car dollies) must have brakes on all wheels when their GVW (trailer/dolly and load) exceeds 1,400 kg (3,086 pounds). Every trailer with brakes must have a breakaway device hooked to the trailer brake system.
Surge brakes must be used when towing a vehicle that has a gross vehicle weight (GVW) of up to and including 2,800 kg (6,173 pounds).
From 2,800 kilograms and up the towed vehicle brakes must be able to be applied by the driver of the tow vehicle.
Motorhomes (only) may tow motor vehicles via a tow bar without brakes hooked up on the towed motor vehicle, when the towed motor vehicle's laden weight (weight of towed vehicle and its load) is:
less than 2,000 kg (4,409 pounds), and
less than 40% of the gross vehicle weight rating (GVWR) of the motorhome towing it.
Motor vehicles with a laden weight of 2,000 kg and over towed by a motorhome must have brakes and breakaway device hooked up.
Preparing to tow
The vehicle on tow must have valid licensing and insurance.
Only one (1) trailer may be towed at a time (a car dolly carrying a car is regarded as one trailer).
All vehicles being towed via a ball hitch must have safety chain(s) or cable(s).
A recreational vehicle towed via a 5th wheel hook-up does not require safety chains or cables
All vehicles being towed must have lights connected to the tow vehicle.
Maximum widths for Recreational Vehicles
Maximum total overall width for recreational vehicles is 2.6 metres (8 feet 6 inches)
Mirrors (only) may exceed the width of the vehicle by 20 cm (8 inches) on each side.
Maximum lengths for Recreational Vehicles
Maximum total length for a motorhome is 14.0 metres (45.93 feet).
Maximum length for a towed recreational vehicle is 12.5 metres (41 feet).
Maximum overall length for a combination is 20.0 metres (65.6 feet)
For more information on the above, and other matters related to recreational vehicles, visit the BC Ministry of Transportation & Infrastructure website (Commercial Vehicle Safety and Enforcement) at
www.th.gov.bc.ca/cvse, or contact your nearest weighscale/inspection station, or call ICBC at 1-800-950-1498.
For commercial vehicles it's much the same, 20 meters for semis, 23 meters (75') for A, B, and C trains.
If there are air brakes involved or your trailer is over 4600 kgs (10000 lbs), you need a class 1 CDL.