OnX with starlink/Tmobile is my go to. I tried to download the maps in the past and worked most of the time, but since adding starlink to Tmobile, game changer.
I’m not sure about the insulation fix, but I’ve tried multiple things. Bushings, washers, foam, furniture stoppers etc. They all worked but had a flaw or downside. Foam gets wet, bumpers stop vibrating completely but create a wider gap which makes the rack crazy loud. Only “fix” I have found is...