ProTech Underbody Box - 15X15X24 Diamond Plate Drop Door Style Bright Aluminum Model 20-2015D 4" They are perfect for mounting

They are perfect for mounting standard ball mounts

1-1/4-In Opening

Fits 3 Inch Square Receiver

We highly recommend these side mount boxes with weather-tight sealing and commercial build quality at an excellent price point

This particular set of running boards is designed to fit specific years of the Ram ProMaster 1500

ProTech Underbody Box - 15X15X24 Diamond Plate Drop Door Style Bright Aluminum Model 20-2015D 4" They are perfect for mountingProTech Underbody Box 15X15X24 Diamond Plate Drop Door Style Bright Aluminum Model 20 2015D ProTech Underbody Box Secure, Weather Resistant Storage Solutions. ProTech Underbody Boxes are the ultimate choice for professionals seeking reliable and robust storage. Designed to withstand harsh environments, these boxes offer secure and weather resistant protection for your valuable tools and equipment. Dimensions: 15in H x 15in D x 24in L Secure storage