Congrats on the new rig. Now I'll admit I know nothing about that rig and the quality but if having an 'orphan' rig is your biggest concern you really have no problem. If the rig is built decent and you do the normal PM to maintain it you show be in good shape. We have been full timing in a 2008 Hitch Hiker for the last 12 years and never even think about the company being out of business. Most of the systems were sourced from someone else anyway (appliances, axles, hydraulics, etc). Take care of it and enjoy it.
The one thing I can think of off the top of my head is check the age on the tires. I replace mine every 4 1/2 to 5 years. They will not look worn but they are aging out and RVers almost always age out tires.
2004 Volvo, 2009 smart car
2008 Hitch Hiker Champagne
Full timing January 2010