I just took mine off of a 10ft tower and mounted it on trailer for this very reason.
15ft, you either going to have to rent a telescoping cherry picker or lay it down. No way I would try to drag something that tall.
M&P-10+AAC Cyclone - Kel-Tec RFB+Griffin Sportsman Ultra Light 300
Pulsar Apex XQ-50
ATN OTS 336-70mm 60hz Thermal Monocular
ATN OTS 336-30mm 9hz Thermal Monocular
ATN NVM14 NV Monocular