Here's a rack that Bro Willy built to carry engines and transmissions to the car wash for cleaning. Says they don't object at 6AM on Sunday. It keeps the mess out of the pickup bed.
I like the idea. Seems like a lot of tongue weight, though. Esp on a little truck?
Not sure if I have a pic, but those wheel dollys for rolling a car around a garage work well for moving engine/trans assemblies around the garage. I bought a couple from Paul @ HGR and they work great for moving all kinds of stuff.