by Squigie » Tue Dec 10, 2019 10:45 am
Basic break-over is simple here.
It's just the double the angle necessary to intersect the bottom of the trailer at half the distance from the trailer axle to the rear axle of the tow vehicle. Because break-over is the limiting factor, due to the drag point always being the bottom of the trailer, approach and departure angles don't matter in the calculation (in my opinion).
If you want to know what you'll be dealing with in off-road situations with articulation, you just have to draw it out and do the geometry. It's simple stuff.
Just because you'll be dragging the belly doesn't mean you should ignore the rear end, too. If you think it's going to drag, do something about it.
I don't think casters are a good idea. Either notch it, or add a skid plate (or skids).
If you want to get anal about the angle of the dangle, break-over is also influenced by the TV's wheelbase and clearance geometries (break-over, approach, departure). But for a single axle trailer, I don't think it matters enough to do the math.