Hi girl mark,
I found a class 1 hitch for my audi at Wally world (walmart) earlier this year; however, it was on clearance and I haven't seen them there since. The thing is with the audi 4000, the place to mount it would be to the bottom of the trunk, which like the sheet metal on the rabbit, is not very strong.
If I was going to slap a hitch on a regular rabbit, I'd probably utilize the bumper, even though this is probably not recommended since it is technically not a 'fixed' thing, but I'm sure it's stronger then going through the floor and I'm sure that the loads imposed by a class 1 application (<2000 lbs) would not be enough to compress the gas bumper shock.
I'd almost be tempted to get one of those class 2 reciever deals that is basically just a 90 deg piece of metal with one of those square recievers. I'd probably mount this to the underside of the bumper and then you can use your choice of square hitch deals to get the apprpriate height for the ball. That and you could remove the ball and hitch bar when not in use. That or just drill 2 holes in the bottom of your bumper for the safety chain, one hole in the top, slap a ball in and call it good. :shock: But then you'd have a hole in the top of your bumper. :lol:
I guess if you were going to mount the class one to the body you could reinforce the inside of the spare tire well with some steel flat bar, just drill holes in the appropriate locations and this would probably work fine. In fact this is what I'll probably end up doing to the 4000. Then you just have to make sure you have clearance with the bumper.
Sorry about the lenghty response, I guess the quick answer is walmart, just wanted to pass this along so you don't end up with a noodle hitch like my 4000. Too bad the rabbit doesn't have solid bumper mounts like the pickup.
BTW I've been enjoying the homebrew guide.
Hope this helps.