After riding with this for a while and considering how best it could fit differently proportioned top mounted boxes I came up with some thoughts.
To fit wider setups, these straps need to be lengthened an inch or two, or better yet; be adjustable.
velcro here and on the opposite side needs to be added to secure different strap lengths. Slightly longer straps would be a nice addition too for taller packs, my double stack is already fairly tall imo.
It held up well over the trip and was very easy to remove the batteries for shipping.