Heavy Duty Sewing Machine mounted in table -- Newark-Caplan CK-563
From the info site (http://www.chikon.com.tw/ck-563.htm):
Single-needle, Unison-feed, Lockstitch Machine with Vertical-axis Large Hook
The machine is equipped with unison feed mechanism and vertical-axis double-capacity hook. It is applicable to an extended range of heavy materials for industrial use, such as cargo handling belts and containers, as well as those for general use, such as car seats, sofa and bags, etc.
It works great, been using it for sewing fake fur household goods, comes with extra motor (to upgrade or because we were nervous we were going to burn this one out!). It's a beast (very heavy) but a great machine. Would work great for canvas, leather, etc.
$1000 OBO. It's really heavy and big -- you will need to pick up (though I have someone who can help get it into your truck).