Davis Peak is the site of a regional broadcast NOAA Weather station operating on a freq of 162.525 at 100w to a gain vertical antenna. See https://www.weather.gov/nwr/sites?site=WNG604
Consequently, expect front-end overload with your 2m handheld. I have used my SotaBeams 2m RF bandpass filter with very good results. See https://www.sotabeams.co.uk/bandpass-filter-for-2m/ Cost for a USA purchaser is $48.
I also choose to operate on the south slope of the peak - not on the summit proper - in order to minimize RF interference and the generator noise from the trailers on the north side of the summit. Davis has a great propogation footprint into the Willamette Valley, west to the coast, but somewhat limited into the Sea-Tac area due to intervening terrain. S2S opportunities would be great, however.