When I had it parked under a couple of tan oaks, I ended up making some cowl covers using hardware cloth and some scrap sheetmetal. I had problems with oak leaves getting in and holding moisture against the inner cowl which is pretty typical. The mesh worked great to stop the big flat oak leaves.
Now I have the same issue with redwood duff, and when dry the stuff crumbles into tiny kernels, so the mod hasn't helped that as much. I put a tarp over the cab and cowl now since it works to keep both the duff out of the cowl and it stops the irritating leaks when it rains.
I also put mesh over the side vents behind the fenders since I was sick of having rats stuff the blower fan full of acorns. At least that worked to keep the rodents out (haven't had the acorn issue in almost 2 years, and for a while before I put screen over the vents, I was having to clean it out every month or so). So, small victories.
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