Roadmaster Comfort Ride Slipper Spring System with Shock Absorbers

I just purchased the RoadMaster Comfort Ride Slipper Spring Kit with Shock Absorbers as well as 3 MORryde X-Factor Braces for my 2022 Grand Design Reflection 337RLS. I was wondering, for those that have installed the RoadMaster system, did you use the self-tapping Grade-8 bolts to mount the slipper box to the frame or did you buy normal bolts and use an actual nut to make it more secure?

Thanks,
Dale