Well I must say that I recently purchased the Wally World Magnet base lights and am very pleased. I will also admit that I do not have really bumpy areas to use them in, but I have backed under my oak tree and had the branches catch them and not knock them off either. I don't know what kind of work you would be doing, but I wouldn't think that on the tractor you would be knocking them off that easily.
I also like the idea that I can put my lights on and off in 2 minutes. I will only use mine in the Winter for plowing, so typically trees and such don't come into play (in fact I didn't think that I would hit the branches that I did so I will be trimming those as they startled me when it happened).
So for $14.88, I think the magnetic lights are a decent deal and they provide a nice amount of light for plowing. My first outing, I used one forward and one back, I have since switched to two forward and installed one of my Harbor freight specials pointing backward (I originally purchased two fog lights from Harbor Freight but didn't like the light output, so I ended up with the Wally World lights).
I also ended up cutting the cigarette plugs off and installing a trailer lighting plug set that I had so I could have all three fed from one plug and easily remove with out removing all of the wiring.
Well that is my 2 cents, take it for what it is worth. I don't have pictures because my camera has been broken for a couple of months and I'm debating on getting a new one for Christmas.
Good luck,
