Does anyone here have experience using tilt heads designed for monopods with a large format camera?

What I was looking at specifically was the Manfrotto 234 tilt head. The idea would be putting this head on top of a Arca Swiss P0 ballhead, and using it with a very light field 4x5 camera. The P0 would work like a leveling base with a pan base on top, and the 234 head would give me tilt. Very lightweight, and should work essentially like a 2-way head on top of a leveling base (and I don't care much for the 3rd movement, lateral tilt, I prefer level horizons). It would also be usable as a ball head by keeping the tilt head locked, or removing it.

The tilt head is only rated to 5 pounds, but there seems to be those claiming it is strong enough for much more. Those people are probably not putting 4x5 cameras on top, so I'm curious if anyone has tried.