What type of vehicles are often operated beyond the designed gross vehicle weight (GVW) of their chassis?

The type of vehicles that are often operated beyond the designed gross vehicle weight (GVW) of their chassis are homebuilt apparatus. This is because homebuilt vehicles are often custom designed and constructed, which can lead to modifications that result in surpassing the intended weight limits set by the manufacturer. These modifications may include adding additional equipment, larger engines, or other features that increase their overall weight.

In contrast, commercial fire apparatus and luxury vehicles are typically built according to specific industry standards and regulations that ensure they remain within safe weight limits for their designed chassis. Standard pickup trucks, while they can be used for various purposes, are also manufactured with defined weight limits that must be adhered to for safety and performance reasons.