Something like these then?
Your illustration shows a truss with enclosed space for storage. Instead, try the ones that are most economical of parts. They use triangles extensively, and exclusively.
Get a whole bunch of them, because you’d be going through them like using up roofing nails.
Stack one on top of the one in the center such that its right diagonal overlays the left diagonal of the center truss.
Then put another one on the right, overlaying its left diagonal on the center truss’ right diagonal.
This is four sides of a hexagon. Or, depending on the slope of the trusses, a gambrel roof sketch.
Now tilt it up, securing the feet on the sidewalls of the foundation. Keep it from falling over, and add a long 2 by ten or twelve on each side, supporting the center truss end-point. Now it will support a snow load.
Put in diagonal bracing to order. Add these composite trusses for the full length of the barn. Then sheathe it, and clad it, and you’ll have a barn that will hold up to most of what Mother Nature has to bestow.
Something like these then?