On a relatively with no tight bumps or ditches, as in when crossing a dry creek bed, I know from my experience that the rear hitch receiver will drag before the plumbing will.
Therefore, I would be inclined to bend the rear part of the protective cage up at an angle, perhaps around 45 degrees, right after the sewer connections and then bend another angle to go vertical just behind the low point drains. Being squared off like that, I would likely hit the back edge of the cage on many of my trips.
But, most people do not go where I go. So it ought to be find for them.
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