Thanks, guys.
Yes, I'm already rearranging things to make them fit on the existing shelves. Not exactly sure what I'm going to do next. Probably relocate the last trailer to "storage", and just bring them out for photo shoots. Problem is, it's the AMT Tank Trailer; and every time I touch it, something breaks off! Looks like I might have to make a trip to Lowe's to see if I can get some more shelves. Or maybe IKEA.