Need help for locating a new Generator box

Mine weighs less than 50lbs and I place it away from the truck/trailer usually on a small sturdy stool or campground table off the ground. Maybe OP can find a large rubbermaid like container for the firman just for carrying purpose and use it on a cargo carrier. I use different size rubbermaids for storage and they work great. I have seen boxes like he wants on the internet using Google search. To each his own

Check tractor supply or harbor freight.

Running it like that makes it louder and vibrates the trailer.

I sometimes carry my Firman 2000W genny on a HF cargo carrier mounted to my truck trailer hitch and other times carry it in the bed and I have seen similar cargo carriers mounted behind TT. They may have a hitch on the trailer or bolt the carrier to the bumper. I have a thick Honda cover for my Firman and then wrap it in large black garbage bag if suspect wet conditions. Carry the accessories in a small rubber mate container inside the camper shell.