Drive Thru electric fence gates

Has anyone used drive thru electric gates?

We are thinking of selling them on our web site, http://ift.tt/1QevOI0 but wanted to hear some feed back first. they come in 2 sizes 13-19 feet, or 18-24 feet.. Which should we stock?

thanks

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J.C. Remsberg
Valley Farm Supply
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Drive Thru electric fence gates