Just me...I try to take 25-30% of the trailers dry weight to figure loaded weight...but for a TT Toyhauler that could be 50% or more of UVWR. Especially if you plan on taking 'toys' with you. If your not planning on taking toys there are better options in a trailer.
I can easily see that trailer being more than 9,000 lbs loaded... That 9,000 lbs is clearly in 3/4 ton range... The tongue weight could be more than 15% due to the nature of toy haulers...basically...if you have your heart set on this trailer I recommend stepping up to a 3/4 ton truck.
Can you tow this trailer? Yes..there is nothing physically keeping you from hitching up...but it's too much for the truck...
Something that is often lost when shopping is that the tow rating of the truck is just ONE piece. Often it's the payload rating or the receiver rating or the tire weight rating or the axle ratings that get maxed out long before you reach the mythical tow rating. It's the component that gets maxed out first...that's your true rating...and as the operator you have to know which one and at what weight you will max out at.
As my good friend BenK says..."How much can you tow??...how much should you tow???"
That tow rating is often figured with a driver...no passengers...nothing in the truck...it's not real world. It's a myth...especially in a half ton truck.
Thanks!
Jeremiah