The trailers would be great in flatter, more open terrain. They really limit you on the east coast. On a lot of trails here, if you come across people going the other direction it becomes a coordinated effort with a lot of reversing and maneuvering to get to a spot where one can get around. Not to mention the tree falls that sometimes can be cut away or yanked out of the way, but depending on if you are in a state park, national park, forestry land, game management land, etc dictates how you handle it. Sometimes you have to just get turned around and find another way. Gates can also be unexpectedly closed. The FS does a good job with updating their website with closed routes, but since we have a mix of different parks and areas that don't fall under the Forestry Service and a lot of trails amble across the different areas you can't depend on it. Reasons you find closed gates around here vary, but some examples are: wildlife management reasons, hunting seasons, if the trail is failing and a car crossing could collapse it, people abusing the route (trashing it, going off-trail, etc), landslides, flooding debris washing downhill, fires (both wildfires and management burns), etc.
A trailer was up on my list until
@JButtress brought his out for an Overland Bound event. It was a ride on a staple for just about every overlander in the southeast - Old NC 105 - which is basically just a gravel track that runs across the top of a ridge. Even on that the trailer was a bear. On an actual trail it would be a nightmare. My Subaru is pretty small in comparison to 95% of other rigs, but I've had to reverse more than a quarter of a mile down a trail to find a spot for someone coming down to pass. Downhill always has rightaway.