I keep seeing a lot of refurnished jon boats and a lot of them have two and three trolling motors mounted on the stern. What does this do? Is it just for more horsepower, because I thing you'd be better off just buying an outboard.

the guys with all the electric motors are more than likely fishing electric only lakes

Electric only lakes,..exactly.

Many use both transom and bow mounts.

Remember though that the more 24v motors you add, each gets 100 lbs worth of batteries. Can get so that you are defeating the purpose. It's a fine line but for boats like mine,...2 are a must*. Thanks to The Georgia crew for turning me on to that.

*Things I have learned having 2 motors now.

1. I use 1 strictly for cruising to the next area so it's only "on" for the long hauls. With this in mind, I use the other for both long hauls and minor adjustments while fishing. This being known, I can fish till that main battery is stone cold dead and I will still have a ton left in the "cruising only" battery to get me home. This has widened my "on water" window from 4-5 hrs to 7-8 hrs. HUGE

2. When fishing open water with wind,those long hauls used to shorten the battery time by maybe an hour due to having tostruggle so hard. Now with 2 motors,I push right through the wind, stressing each motor much less therefor increasing battery time.

3. In the wind,the bow doesn't drift if your attention strays for a moment, boat has much more forward momentum, increasing trackability.

The corrections to course before also would reduce battery time. So would paying attention,lol,...but.....

My .02