On my coach 701 control panel, a switch at that position is labeled "DECR WT" (meaning "Decrease Weight"?) instead of "INC LOAD"
Joe Zhao @ Greenville TX 75402
2004 Newell Coach 701, 45-8, 4 Slides, Front Entry
Detroit Diesel 60 w/DDEC, Allison 6-Speed AT, ZF Suspension w/Steerable Tag, ZF Auto Traction Control