I already have a plow blade, so that is off the list. Also have a lawn roller, bigger than that tank, but for the amount of times I have loaned it out and one friend took more than a year to return it, that might be a good loaner... NAH.
The smoker is a real good idea. I'm thinking hard on that one. I don't have one
I also like the sand blast cabinet idea... Although I think sealing it with a plexi or lexan screen might be difficult unless I were to build a riser box like a dormer on a house for the gloves and glass. Would rather use cheap glass for sacrificial screens... They last longer than plexi or lexan, and are cheap enough to replace.
Keep the ideas coming. I'm liking 2 right now.