Good news is that you found out hideout on the internet! The bad news is that the nitrous is a Fleetwood product and when Fleetwood went belly up they dropped trailer owners like a ton of bricks. Fleetwood still exists by name but they offer no nada zip support for the trailer lines. The other good news is that as mentioned you can download most all of the manuals, and many of our members were previous Fleetwood owners that can probably lend a hand if you have a more specific question.
So now the real question, what are you going to haul in your rig?
Two Wire Fox Terriers; Sarge & Sully
2007 Winnebago Sightseer 35J
2020 Jeep Gladiator Rubicon