Hey everybody! I have a little conundrum here. My prospective passenger weighs nearly double what I do. What functionality do I need in a shock that will allow me to both ride with 420lbs in two-up and 150lbs solo? I'm looking at Elkas, but have no idea what functionality is superfluous or exceedingly necessary for a good, versatile riding experience. Cost isn't really an issue, but I don't want to spend more than necessary. I'd appreciate some sage wisdom.