Happier the harder you push
I chose to go with the reservoir version due to the extra weight of the 40" tire and heavy DV8 tire carrier on my Jeep. This is my daily driver, and I can say these, combined with the front Kings are phenomenal. I don't feel much of anything driving down the road. When offroad, the harder you push them, the happier they are. They are longer than the average shock due to the bar pin eliminator brackets, so take that into account when ordering the length you need. I love my Kings!