I have
43mm Panaracer Gravel King SK on my 7500, with fenders. They are extremely supple lightweight folders that roll quite nicely at 30 psi. Should be quite flat resistant with the tightly spaced small knobs and low pressure.
We don't have goatheads here, but glass is a problem. With a low pressure tire you don't force the rubber against the glass with enough force to embed it in the rubber. With glass, most flats occur after many revolutions have slowly pounded the shard through the tread and casing. Most of my bikes don't have clearance for 43s so I usually ride (no longer available in 32mm but I have a stash) Michelin Dynamics. Very thin tread, but so supple I run them at 35-40 and I've never gotten a flat with them.
My lack of flats may also be because I never ride w/o 2 tubes and a pump, as a sign of respect to the Puncture Fairies.