I just went out to ours and, the gas shock/spring, has a 1/2 round clip, shaed like a "C" that is pryed off and then, I hit the shock in an outward direction with the palm of my hand it came right off the ball. But, remember, if there's any life left in the shocks that are attempting to hold those heavy doors open, you'll have to support the door while removing the shock from the ball or, there will be a bind on that end of the shock if you dont support it.
Now, unless your shock end is retained in a different mannor, it should act exactly like mine just did. Some of the shocks use a wire clip that is inserted in a tiny hole and the rotated to lock it onto the ball but, ours is not like that.
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)