Nice looking Mog! Based on pricing I have seen in the past, I would guess that this one could get $45.000. But keep in mind, it's old, barely used... Rubber and plastic parts/hoses/fittings may need replacing...
There are quite a few ex-firetruck U1300l's on mobile.de at the moment if you search for U1300L in the under 7500kg section of trucks with nice low miles for low twenties Euros, mostly in Germany, LHD.
I have no idea if this nice Mog is a U1300L but with 6 stud wheels and high mounted front indicators it most likely is not a heavy chassis model so similar enough for basic comparison. There may be a whole host of expensive extras fitted that may or may not add value to you (hydraulics on the front bumper at least for instance). Folks on Benzworld can search for spec/options when originally ordered if you have the chassis no.