Great answers, from low tech to high tech. Ok, no water bottle, no tennis ball. I engineered the gas strut on the tailgate and installed it before CoolTech came out with his. I've designed a curved curly spring in solidworks today. There is a spring mfg in Santa Clara Ca, that I'm going to visit next week. The idea is simple and effective. It will keep the door open, it will not hinder the closing of the door and will not be in the way like a gas strut would be.
Water bottle???? I drive a $32k Jeep and I gotta use a water bottle to hold the door open? Next thing is you'll want me to park on my grass and have a broken wash machine next to the house. No way. :-)
07 Sahara Unlimited