I was wondering if I can capture some knowledge from those in the know. I do not find the stock seat on my Road King Classic uncomfortable but I have been riding a Ural Russian Sidecar rig for 2 .5 years and haven't done over 90 straight miles on the RK. I do get lower back ache so am considering a drivers back rest. I am thinking of a riders back rest for the stock RK Classic seat and wondering if people think that the stationary back rest is good or is the adjustable rest worth the xtra money. Or would I be better saving my $$$ for a Sundowner Solo with a back rest. With a sidecar I will never have anyone on the back of the bike so a solo is OK with me.