JohnH
+1y
it doesn't matter if the bags are on the axle, behind the axle, or behind and under the axle. the bags are still attached to the axle so it will ride the same. the reason to get a behind or behind and under is for space reasons and so you won't have to cut into the bed (if not running a large notch)
if you want the best ride with this kind of setup, use sleeve bags rather than double convoluted, such as the firestone F9000