Display Morewhy do you need two fuse boxes what are you trying to accomplish in your sling?
If anyone reaches the point when they need two fuse boxes they should be switching to something else that will cost less and in my opinion be better than the fuseboxes "sold for slings".
Here is the fuse block I would go for if i needed more circuits , just need to add a relay to make it a switched power box but even after that you are coming in at about half the price of one of the two boxes you are looking to buy.
Btw this is a marine fuse box for those that don't know so perfect for the sling.
ST Blade Fuse Block - 12 Circuits with Negative Bus and Cover - Blue Sea Systems
Available from Amazon for around $40
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