2004 Tahoe california lite 21-sd

I'm new to the travel trailer way of camping and just bought a 2004 Tahoe california by thor Lite Series M-21 SD. Its pretty clean inside and out and doesn't have any weird smells and doesn't look abused. I'm having a hard time finding specs on this trailer. Does anyone know anything about them or know where I can find more info?
How big of a water tank does this have?
What great ideas are there to make it better?