How do I properly install and mount the Big Blue 400D?

Install the unit on a flat surface using the four supplied mounting brackets with cross-supports to adequately support the base. Secure the unit with 1/2-inch or larger bolts (not supplied) to a truck or trailer, or weld only at the four mounting brackets. Always ground the generator frame to the vehicle frame using #10 AWG or larger insulated copper wire connected from the equipment grounding terminal to bare metal on the vehicle frame. Do not weld on the base as this can cause fuel tank fire or explosion.

From the official Miller Big Blue 400D Welder manual, page 19

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