I'd toolk it that the OP's inquirer was asking about the ball size, since they asked about "trailer hitch type" unless they wondered if it was a pintle connection versus a ball? I remember when I was shopping for a smaller trailer, I ran across a few teardrop trailers that used pintle hooks.
2012 FR Flagstaff T12SDTH
1996 Shadowcruiser Pop Up Truck Camper
1967 Newell Motorcoach
2003 Ford F150 5.4 V8 Triton Super Cab
2004 Nissan Titan LE 5.6 V8 4x4 Crew Cab