Acryl-R panel sealer
Try Acryl-R panel sealer which comes in a can. It wicks in between panels. The pump applicator is needed also. You may have to remove excess caulking if it was heavily caulked before. This can be done with either sharpened popsicle sticks of one of those plastic hook caulk removers sold at hardware stores.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system