I came across a Hensley TSLB on ebay. It looks like it was definitely used, but they clean up and are darned expensive new. Hensley will even refurbish them if you want.
Just in case anyone is interested (no, it isn't me selling it).
Click hereOJ
Vincent
Orlando, FL
2008 Ford F250 CC KR 6.4 Diesel - Air Lift 5000 Ultimate w/wireless air, Bilstein 4600 HDโs, Hellwig BigWig Sway bars, Pullrite Super Rails, Hensley BD3
2014 Lifestyle RV LS36FW