Economical easy to build engine dolly

I have built several of these for small block & big block engines. They have held up well & are fairly easy to build using minimal woodworking skills. Materials: 2 2x10 21" long, 2 1/2" or 5/8" plywood 4 1/2" x 12" long, 1 harbor freight small furniture dolly 11 1/2" x 18". Use deck screws to fasten plywood to 2x10, 2" long. Fasten dolly to the 2x10s using 3" deck screws toenail fashion just at the edge of the wheel mount. You can store 2 or more engines next to each other & take up minimal space. Hold up well with the only problem during long term storage is that the wheels will develop a small flat spot. Not the most stable but I have never tipped an engine over using these.View attachment 1715559449 View attachment 1715559450 View attachment 1715559451 View attachment 1715559458
Good idea and certainly cheap enough to build. Are they stable and not prone to tipping over?