The Arvika site is still up and running. I called the toll free number and it appears that they are still in business. Arvika bike racks Pop top rails was the US name. I always dealt directly with Arvika. Great company to work with.
Stromberg Carlson makes an A frame adapter to 2" hitch receiver (hitch receiver is above your propane tanks) which allows you to use standard off the shelf bike racks.