Stop in for a cup of coffee

I didn't plan on bolting it down, bought the caster kit so I could move it if I needed to (so far I haven't imagined why I would but who knows, stuff happens). If I put plates under it, say 1/4 or 1/8 inch thick I could still use the casters. I appreciate everybody's comments regarding this.
This is my thoughts, while you could probably get plates steel anywhere, unless you know the exact tensile strength needed, is just get them thru bendpak. That way should something fail, they can’t come back and say you didn’t have their stuff installed right and your warranty void. Don’t skimp around when it comes to something that may kill you if it fails while you’re under it or destroy your car