It's a tractor supply special. The rear blowers are for heat circulation. The blow into the same plenum, that isn't divided. So yes you should run both. There was an add on forced draft unit that bolted in the back. It's less then worthless. The thermo disk should be swapped out for a Honeywell thermostat. It will last for years, not months or weeks. Yes it can burn coal, but I never had any luck with it, and have since modified the fire box to hold more wood, amd ditched the shaker grates. Be prepared to replace the original fire bricks, quickly. They are junk. The rear heat shield should last for 2 or 3 seasons (I use mine for primary heat) the blowers should go a few years as well, but I suggest stepping up to a furnace blower. I havent had need to replace a blower in years since I went that route. Parts can be had readily over the internet. Just be warned it's not a heavy duty unit, I've had cracking issues around the feed door hinges, multiple times. When I had it apart to redo the fire box I reinforced the inside around the feed door to help stop it from cracking around the hinge posts. The baffles they come with are also trash after a year or two. I got a local fab shop to bend me baffles out of 3/8" plate. I did have to notch out the center of the baffle shaft to get them to fit right, but have had them in going on 4 years now. The draft control knob on the clean out door also needs the nubs ground off flush, it simply lets too much air in and makes it burn much too hot at times. And remember this thing is rated to something like 3000 sq ft. I heat 2400sq ft, and it will about roast you out of the house on a 30* day if you let it.
Oh and it's made by us stove company. I'll try to answer any other questions you have. I'll get a few pictures up of my blower set up, later this evening