When I tried the CN climb the guy did try to move the bottom rocks closer to the first ledge. However, getting over that was not the problem. I had the front wheels over the last block, but once there both front and rear tires were in the dirt; couldn't even get a rear tire onto the concrete block. >
Everything else was point and shoot.
I found my fan problem this morning - one of its wires wasn't ziptied properly, so it got jammed in the coliover spring and had the insulation rubbed off. Fixed it this morning, and fuse doesn't blow. I had to quite trying Saturday afternoon since I was overheating due to that issue. Motor runs strong.
Props to cru9 for leading our group on the trail.