Most newer Cobra trailers have a little-known feature that can hold the top open if the gas struts have gotten weak or if there is a load of snow or ice weighing down the top. The square steel tube that houses the gas strut often has a small (1/8 to 3/16) diameter hole near the junction of the inner and outer tubes. A pin placed through this hole will prevent the two tubes from telescoping and adds a measure of security if the top has a tendency to sag.