I double tow sometimes, and the 2nd trailer weighs about 4800 with a car inside. I'm headed out shortly to pick up a new tandem axle 16 foot open car hauler to have the option of bringing a different car. That will result in about 5800 lbs for the second trailer. I do run two brake controllers with paired 10 gauge wires for each braking circuit to the rv plug on back of the 5th wheel, plus 3 cameras on the back of the 5th. All lighting is 10 gauge, and entirely independent of the first trailer. I built the hitch myself. Trailer is a '95 Carriage that has a 2x6 box over 2x6 box frame.
