The big disadvantage will be hauling around the trailer with the generator on there, for a large enough generator to get motorcycle power levels.
For some info on the topic, see the various threads about range extenders and generators. Not everything in the lists below will be relevant, but it should be easy to tell which are. Also not every discussion about them comes up in these lists, so you can poke around the forum for more:
search.php?keywords=range+extend*&terms ... mit=Search
search.php?keywords=generator*&terms=al ... mit=Search