1/24 wheel stands/wheel ramps ?

Wirraway

check out these guys they have a lot of scale equipment ypu could use, and a lot more after that.

http://www.seltd.net/selproducts.html

At one time, Tamiya had some 1/24th garage accessories.  Can't recall whether the kits included jack stands.

Push come to shove, you should be able to scratch up your own. 

I don't know who made it, but I think you can bouild one.

For a model I use some tires, like 4 in one side and 2 in the other.