You can use tension wire to hold the bottom of the chain link fabric to the terminal posts

This is a Parking Gate Radio Modification Kit

thereby holding the gate door shut

A 4” Neptune post cap is designed to fit over a 4” x 4” post

The spacing for setting these posts is half the opening

1 HP AC High Traffic Commercial Slide Gate Opener Miscellaneous You can use tension wireThe SL30000UL models are the first choice for heavy traffic applications. Featuring the highest quality components and backed by years of proven reliability, each unit is carefully inspected and mechanically tested to provide unsurpassed performance. All LiftMaster Openers, Operators, and Systems should be purchased through a Dealer and professionally installed. 115V Single Phase 1 HP Rated for gates up to 50 feet in length and 2,000 lbs. SL3000U