Hi all,
Likely not a good choice for Joel, since he's mentioned only needing occasional use, but I thought I'd mention a rack that appears to fill a unique niche in the marketplace and was the only cost effective solution I found for my rack needs ... The Thule Raceway Platform PRO 2 is a bumper mount rack that uses trays to carry 2 bikes, like many hitch racks do; this thing:
I wanted a hitch mount rack, but the cheapest hitch I could find for my vehicle was $800+, then another $300+ for the rack, which doesn't seem like a prudent investment on a 15 year old car. Supporting the weight of a bike on it's wheels makes a lot more sense to me than creating a couple of point loads not far from the center of the bike's top tube, which most trunk mount racks do. In my case the bike I wanted to transport doesn't have a top tube, so trays were preferred, if not required. I'm not aware of another tray style rack that's also bumper mount, so I was pretty excited to find this model Thule. Not cheap, but I found mine for $300 brand new, in the box, so there are deals out there.
I also have a Saris Bones 2 rack that I've had for 15-ish years and still use to transport my tandem occasionally. People seem to love the Bones and it was state of the art 20 years ago, but if you compare the methods and materials it uses to secure the bicycle(s) to the rack and the rack to the car it's apparent that rack technology has continued to advance and racks like my Thule Raceway Pro Platform or other premium models are in a different league. They'll cost more than a Bones, even used, but after having my prized Bridgestone RB-1's top-tube damaged on a older "hang by the top-tube" rack a couple of years ago I'm willing to spend a bit for a rack that better protects my bike, my car and my nerves.
-Jack