maybe keeping your spring fully extended is best, when you install the top cap and spring clip, that makes it air over oil suspention, what if I installed a air valve in the top cap and put in 5 or ten lb,s of pressure,. how long would the pressure last,. thinking about it 1 lb. might be good,. 15 lb.s in my van keeps it level with 600 lb.s in the back, with air lift bags,