I went through a similar exercise. I used Great Stuff Rodent preventer foam. I foamed openings throughout the basement, plumbing cutouts in cabinets as well as underbelly hoping to reduce the number of entry points.
Doug & Cindy
2014 Cedar Creek 36ckts, Disc Brakes, EMS, Trav'lr, 20k GooseBox
2018 Ram 2500 CCSB CTD 4x4 RASS