Speaking of deflated...I guess others on here deflate their tires to fit into the garage?
As for hitch, why didn't you just go get the adjustable drop hitch from harbor freight for $25? Always in stock, and I'm not a big harbor freight guy or anything but it's a pretty dang good ball mount, I use it all the time now. 11" max drop.
I have used the HF version for the last 2 summers almost every weekend.... just for lowering to get the boat in and out of the garage.... no issues.