1. Is it possible to equip a monster trophy on geralt himself? I noticed he has a hook on his belt.
2. When you equip a trophy on Roach, do the trophy's abilities also apply when you are off Roach?

I just a guess, but since some of the trophys are HUGE, I think they just made it so its always on Roach.

and im pretty sure they add a bonus off horse, anything else would make no sense.

(eksample) +5% gold gained only on horse back, were you can't pick up stuff or complete quests from.

thanks for the answer! :)