I don't agree with that Redneck ,i have the 04 Patriot Dually and I'm yet to have that problem even during it's break in period it shot fine ,a little tweek and it's shooting better than ever now . I think it boil's down to the type of string and cable's on the bow that make's the difference,if you have good string's and cable's there shouldn't be no creeping or very very little to effect your shooting. This is just my opinion on your topic and I haven't had any issue's with sighting . Maybe someone else with a little more experience with duallies can help you better but I'm sure they will say the same.

nubo