I own a 1980s Panasonic (steel) road bike without eyelets for a rack or fenders, and I'd like to add a rack. The seat stays and chain stays on this bike are a bit thinner than I'd be comfortable to use P-Clamps on (and I'd rather not use them for all of the mounting points of the rack).
There exist racks which are somewhat designed to alleviate this, such as the Axiom Streamliner line shown below:
This one mounts to the caliper bridge and can use a quick release on the bottom. However, since my bike has horizontal dropouts, I am not sure if there is anything else I need to be aware of for using a quick release mounted rack. Typically the rack will be loaded with 5-20 kg. The skewer is an old Shimano one, probably the original one which came with the 105 hubs.