On our Springdale fifth wheel, the drain fittings were about the same place they are on your trailer, between the front axle and the front of the trailer. I also was concerned that it might be damaged, then I started looking closer and thinking about how exposed it really is.
Take a straight edge, or stretch a string tightly, from the bottom of the tire forward to the lowest point under the front of the trailer. On yours, that will probably be the lower point of the A frame. If the drain fittings are above that string, then there's little chance it would contact the ground. I've seen some Passports that appear to have the drain much lower than others and some of them have been "towed a far piece" and they don't seem to have any repairs in that area, so it's probably not as "vulnerable" as you might think. Do the straight edge "look-see" and if it's above that line, you're pretty much OK.
From the trailers I've seen, I would be much more concerned with knocking off one of the scissors jacks than damaging the plumbing.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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