I built one with an articulating hitch and 35 inch tires and it will go anywhere I drag it. I agree that sand hills or dunes can be tricky depending on tire size and vehicle power. I have broke the trailer axle on rock trails so obviously there are limitations. There are several types of trails that are difficult with a trailer. I think you just have to plan ahead and be ready to park the trailer if you want a particular trail. Tight switch backs on shelf roads could be very difficult. Single lane mountain shelf roads also.
On some trails, opposing traffic has to reverse to a pullout. I pulled my trailer once on a road like this...and made it...but too nerve racking to do it again. Reversing a trailer on a single lane shelf road with a 500 foot drop nearby is just not for me. Doable...sure.
More important is how do you secure your investment if you park it for a while to hit a trail. Locking hitches, wheel locks, chain through wheels, etc. Truth is though if a thief wants it... they'll figure a way to get it.
So plan ahead and know the trail. I have had plenty of anxiety on tight shelf trails and plenty of worry leaving it parked somewhere. Either way plan ahead and enjoy the benefits of an overland trailer.
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