I have seen some single person machines with 2 adults on them. Not pretty....I have to guess that would be hard on the machine too. The touring machines have a little longer wheelbase to make it work. I have had grandchildren on my machines in the past. When they were little sitting in front of me and as they got older and taller behind me. I have a rear rack box so they have a backrest and I don't have to worry about losing them when I gas it.
Mine: 2018 Sportsman 850SP - 26" Bear Claw HTRs on OEM steel wheels(I really don't like the Aluminum ones)
Polaris Hand warmers, Mirrors.
Hers: 2007 Sportsman 500 EFI, Polaris Winch, 26" Bear Claw HTRs on Moose 427x Wheels. QSC Clutch Kit, Hand Warmers
2001 Magnum 325 MOSE 12" rear wheel conversion. 25" Sedona Coyote tires
2001 Magnum 325 Warn winch and Moose 60" plow
2017 Polaris Ranger 1000XP - Roof and front glass
SOLD 2004 Sportsman 600 Twin