Don't know about the ATPs, but I recently put Cooper Discoverer ST/MAXXs on my RRC and love them. More aggressive tread than the ATPs. In hind sight, I may have gone with the STTs, but I had trouble finding them at the time.
'95 RRC SWB
'95 RRC LWB (Sold)
'06 E350 Sport
'87 HD FLST w/ '02 Fatboy sheetmetal
'02 Hobie Getaway