How much can my Titan really tow?

So I just bought a 2012 Titan SV 4x4 from a shady looking individual. I've been thinking of taking my Dads travel trailer off his hands. Total loaded weight of this bad boy is a hair under 8000 pounds. Only problem is I can't seem to find my gear ratio or towing capacity. 3 dealer phone calls later and 3 different answers ranging from 7000-9300 pounds has me scratching my head. So I thought I'd come on here and see if someone could help me out. Here's what I know...

2012 Titan SV 4x4
Has Trans temp gauge, but no Big Tow mirrors
Has Front tow hooks, receiver hitch, and rudimentary brake controller installed, all look to be factory OEM (but I'll admit I've always been a Chevy guy and I feel the only thing the previous owner ever hauled was his *** down to the meth store, so i don't see him installing these for any reason).

I've looked for the sticker on the rear axle and it seems to be long gone, I've tried doing 70 down the highway but I'm at 1800-1900 rpm just in between what everyone on here says is the difference between the 3.36 and 2.93

This might be a stupid question, but when my families safety is involved you can never be too careful. Thanks in advance.