I would talk to hitch shop or lippert. I know the hitch that comes on the Montana is only rated to carry 200 to 300#. sounds like your tool box mite be a little more than that.
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Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
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