Should be no problem as long as it is low geared and has a centrifugal clutch, I have moved some very large trailers with the Honda TRX300 on our farm.
Loose gravel is your enemy, as is any sort of a hill, and needing to stop in a hurry. All three together is really bad news
(no prizes for guessing how I know...) but for moving a boat trailer around on the flat on hard ground, I think it would be OK.
Noseweight on the hitch will be something you need to check though, as a 100cc quad won't like a quarter of a ton on the back!