Double towing is not legal in some states. You need to do some research before going that route.
Some states that allow it, require the first trailer to be a 5th wheel BUT there are length restrictions.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package