I have yet to shovel any "pay dirt" thru it, just gravel from the yard...lol. I need to try it in reality! With the water levels so high and everything an hour away I hate to waste time driving anywhere I can't work the dirt! I do think the 3700 would do okay. Like you said, a bit more slope...still more fun than classifying!Looks good. Have you shoveled material into it? Seems like that would do the job well, maybe with just a bit more slope to let the rocks roll off the griz. Clearly I'm gonna need a bigger pump!