The 50 amp box is good for what ever load the unit is pulling "up to" 50 amps. I have the Progressive hardwired unit but if I was buying again, it would be the Frank's Booster. Very nice units.
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Leo and Janice
2007 MS 36 TK3 Glide Ride pin box
2012 GMC 3500HD D/A CC 4X4 DRW AirSafe Hitch
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