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My travel trailer has a regulated lp system as most do.
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Yes, most trailers have a regulator located near the tank(s) that reduces several hundred PSI of tank pressure down to around 0.4 PSI (or around 11 inches of water column).
You definitely don't need to pass this low pressure through another regulator on your grill.
So I'm thinking of doing this: cutting the regulator off, cutting the tubing off like this: and cleaning up the ends and putting a clamp or two around it. It is a very perfectly tight fit I'm sure I can keep from leaking. I can prob even flange the metal if need be.
Anyone know enough about lp gas to tell me if this will work?
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If you're talking about removing the regulator on the grill, it should work fine.
That same technique is often used when installing "Little Buddy" propane heaters inside RVs - The regulator inside the Buddy Heater isn't needed, since the RV's regulator accomplishes the same thing. So, most folks just remove the regulator inside the heater, connecting what used to be the regulator's low-pressure outlet directly to their RV's (low pressure) LP supply.
Shouldn't be too hard to prevent leaks, since you're only dealing with a fraction of 1 PSI of pressure.