Of course you can. It's just more difficult. I used to do it for fun, pretty sure a more powerful rider like Damon or TRA could sidehop such a thing quite high off the ground.
People are too focused on what the definition of trials is. At the end of the day, it's still the same sport it was 25 years ago but instead of having a log and muddy hill on the course, you've got large obstacles which actually take some trials-specific skills to challenge.