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10 pound is easy 15 is doable but a little tighter-
someone talked about a 20 but decided it wouldn't fit-
I think 2 10 pounds would though, both upright- just adjust pickup tubes-
I have the monsoon system, but I don't think the amp is on that side...at least not on mine. I had to move the motion sensor for the alarm system up a little to make a remote bottle opener fit (last setup, NOS).