The overall dimensions of this box are 35" long at the back, 18" long at the front, 19.5" wide, and 18" high. A standard 20 lb. propane tank measures approximately 18" high with a 12" diameter, so it would not fit with the lid closed.
To attach the toolbox to the trailer tongue, position it on the trailer tongue. Drill four 3/16" holes through the bottom of the toolbox and the trailer tongue. Secure the toolbox using the provided 1/4" x 1" sheet metal screws and 1/4" x 2" fender washers. Tighten the screws with a 3/8" wrench or socket until the toolbox is securely fastened.




