My 2020 had been on life support (Deltran Battery Tender) for about 5 months while stored for the winter. Doors not locked, hood closed, and hooked directly to the battery. No issues with the horn or anything else.
I just bought a 2020 1500 Crew, RST, Z71 with protection pkg, All Star Ed. in Shadow Grey Metallic, $51,705 msrp, purchased for $36,250 +T &T. I think I did pretty good.