RE: 2018 Chevrolet Equinox battery dyeing
The 2018 and newer Equinox and Terrains pull a lot of power in Accy/tow mode. Your charge line might be too small. 12 gauge wire is needed. I've been fine at 5 hours tow time but had a dead battery after 8 hours. I'll always start and run my Nox at 4 hours max unless I'm nearly there.
RE: tag axle shocks
Monroe 555043 or #34722, however it does not appear to be a current product. Try checking around to see if you can find some old stock.