Current IMCA setups

With the way most modifieds are being setup (nose down with tie down shocks, etc), what kind of spring rates are being used in the rear? Also, I understand that guys are measuring droop and loads, so what is being done with the j bar when guys are using a little higher rates (specifically the RR) in the rear? We run in the west where 99% of the time the track dries out (dusty dry or sometimes rubbered up dry) with very little humidity so the track can never hold enough water.

Also on a side note, these threads don't do any good without responses and interaction. I've noticed a bunch on here with hundreds of views and 0-2 responses. Let's help each other out guys!