Whoa, that trailer looks like triple axle time!
It is amazing what the 2500 series HD will haul.
I found an identical one online and what an amazing iinterior they put together on this trailer! 3300 pounds CCC with a toy hauler doesn't seem like all that much. What a difference it would have been if Heartland would have went with triple axles on this toy hauler.
Between fresh, grey and black water you have a bit over 200 gallons (1660 lbs) and that leaves 1640 for everything else including your toys!
Ok, your hitch weight is 3090 pounds, so with GCVW considerations, does that in effect give you an extra 3090 pounds then for cargo? I am not sure how that work. If that is the case, you got tons of weight room then.