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I've seen water filters built into some very expensive RVs as OEM, never on a Montana. If it does happen to have one, I would think it would be located somewhere readily accessible and visible for maintenance.
I've never heard of a backflow preventer causing a pressure drop, but that doesn't mean it can't happen. I agree that the filter screen at your city water inlet connection might be the most likely suspect, but I would think you wouldn't see an initial higher pressure then drop.
It could be an issue with the CGs water mains too. If your site is at the extreme distance from the CGs water meter usually located at the road at CG entrance, they may have installed pipe that is too small to deliver a good pressure and flow rate throughout the CG, or maybe added additional sites and didn't upsize the mains for additional sites. You might check with other campers near the CG entrance, or check their bath house for same issue.
A good way to check would get a water hose "Y" connector and install on your spigot, connect your regulator/inlet hose to one port. Connect a gauge on the other and turn on the water in your Monty and go see what the pressure is on the separate gauge. I carry both of these on my rig. The pressure gauge I'm referring to have a water hose fitting and has a "drag needle" that stays at max pressure until you reset it. It's a handy tool and it and the Y fitting will cost you all of about $25.
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