I just used scrap pieces of wood for the spacer. http://www.amazon.com/Exchange---Blade-2100005-Laminate-Flooring/dp/B00B0BYY4Q/ref=sr_1_1?

I rented a floor buffer from home depot, along a with carbide tipped blade attachment.

It would have taken a while to cut all of those 600+ tires by hand with a razor blade to each sidewall,  it I know a lot of tire shops that do it that way everyday.

In Texas you dont have to rake much if you use a zero turn and a mulching blade.

I've even had a four blade fan turn into a three blade one when a tenant had moved out. 

I put river gravel over the top for cosmetics but that gets caught in tire tread so you probably don't want to do that.On the really big pieces where there was a raised edge(similar to the break closer to your carport), I took an angle grinder with a diamond blade and smoothed out the edge.

.), cut out the porcelain-on-cast-iron bowl out with a grinder equipped with a diamond turbo blade, and then carefully keep cutting small pieces until you get the bowl down to the granite.

Now the tenant claims blades need to be sharpened however the grass was allowed to grow about a foot high so even the sharpest blades will not get through that.

Maybe a combo of Venezuela and Blade Runner!

It would seem likely that someone over the past 50 years might have placed an eye bolt or some other piece of metal in the trunk that would destroy my saw blade.