Thinking about making a Liner character and was wondering which house OSC belonged too. Also, is there any other IDs other than the researcher that can use Luxury Liners?
You can go into Rheinland, just make sure you only have human cargo. If you're in your OSC Liner with something like Military vehicles, you're going to be slapped around the face, if you instead have VIPS, Vacationers, Tourists etc, you're fine.
It's a company that originates from Liberty, but maintains the resorts all over the Sirius. It also has control over Planet Baden Baden, so, of course, it's allowed to operate in Rheinland.
Basically, consider it less Liberty-affilated corporation than Interspace, but not the one having totally no ties to the House.