x2 on the grounding. Unloosen and clean everything that you can around the jack where it mounts to the tongue, bolts and maybe the jack itself. Have another type jack to hold the tongue up while you are messing with it.
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler