Reese dual cam… driver side seems to have more tension.

Of course having the trailer and tow veh both equally level is one thought, but I would check the hitch head for being slightly off level, or twist in shank or box. Our head is slightly off level, and one side (right in our case) is slightly different on tension, but not much so I don't worry aboot. No major difference in wear on the bars or cams. Also, when you pull up one side, the other side WILL have slightly less tension when lifting bar.