I am not sure if Racktime has a distributor in USA at this time. They used to but for a while they did not. But you should be able to order from Europe if they do not distribute here at this time.
Two models, the difference is that one of them has bolts on the plate that attaches to the dropouts, the other one is welded, depends on how far you want to break it down.
https://www.racktime.com/en/racktime...ct/foldit-fix/
https://www.racktime.com/en/racktime...it-adjustable/
Lots of little bolts and nuts to get lost, bring spares.