This generator weighs approximately 500 lbs.
I am designing a portable platform for it, in the following way:
It will be on four 13", 5/8" axle pneumatic wheels with bearings that are $5.99 at Harbor Freight.
Then there will be a plywood platform over these axles. Size 2x4 feet. Underneath the platform, there will be two 2x6 boards running along the longer edges, with holes drilled for the axles. The axles will not spin, the wheels will spin separately as they are on bearings.
On that platform, there will be two used 2 foot diameter tires whose purpose would be to provide cushioning and vibration dampening.
Above that, there will be another platform to which the generator will be bolted.
The generator legs form a square that roughly 16x16 inches. I plan to put the generator legs on 2x4 pieces, laid in a diamond shape like this
_______________ | / \ | | / \ | | \ / | | \ / | ~~~~~~~~~~~~~~~
The legs of the generator will be bolted to these four edges of the diamond made of 2x4s, each leg being in the middle of each edge. I am sorry if my explanations are not very good, I am a foreigner.
My question is regarding this second platform. I want to make it from two layers of 3/4" plywood, glued together. One 3/4" layer is not strong enough. The question is, is strength of 1.5" plywood (2 3/4" layers) good enough to support a vibrating 500 lbs generator, given that there is plenty of cushioning from the tires underneath.
Someone suggested a torsion box. I do not mind that, as such, however I am concerned that its extra thickness is going to raise the center of gravity of this construction, too much. Hence, I will do a torsion box only if absolutely necessary. I hope to stay under 4 feet total height, in hopes of lowering cost of the generator enclosure.