I run the WalMart lights on my Explorer(4x6/55watt) and my B2(large oval ones/55 watt). For the speed you are traveling while running trails what is the need to see 1/2 a mile ahead of you? I could see the use if you were speeding across the desert, but at 2 - 20 mph the WalMart lights light up the trail fine for me. If you got the cash to buy the expensive lights go for it, but remember they are usually mounted where they will get hit by branches and rocks and stuff. I'd rather replace a set of $20 WalMart lights instead of a set of $100 KCs...

Just my $.02...