A wider selection of small 3-way Dometic models is available in Europe. I bet the RM4210 would be perfect... if you could import one and convert it to 120V, that is.
Wonder if that's where gravity furnaces are hiding too?
Note on the Euro Frigg'ies - The RM 2193 I baugt online new last year was a EURO, All the same as the North American model but it was setup for 240V Euro. It actualy did work on 110V but did not get cold enough (As I figured) I have not ordered the 110V element for it yet but it is an easy conversion. I recomend doing it beofre you install the unit as it is significantly easier to change the element on the bench.
The RM2193 does not seam to have any controlls or piping in the mid-to frontal section of the unit. If somone were willing to try it, it would be possable to cut it in half and remove several inches of body and then sew it back together with sheet metal. You could seal the inside seam with some of the material that was removed and glue it on as seam tape. Of course this would void any and all warranties but would be a great way to restore the trailer to it's original spec. You could build a jig and use a saws-all to do the cutting. As far as I know the core is just foam. Sounds like there could be a small market for somone that was good at it! Be like the hotroders.... Chop Chop CHOP!