First time rving

Agreement. You would be pushing the envelope until it rips.

"I know its big but we have a big family."

Doesn't matter what size family you have. If your TV can't safely pull it (from a gross weight standpoint and from payload standpoint) your big family will be endangered. And, that TT overall at 40 feet is a big TT for a newbie and limits the number of CGs you can use particularly government CGs. This is at least the second time you've asked about this. Are you waiting for an answer you want to hear? Not from me...get less TT or a bigger TV.

Too much trailer for that truck, especially regarding payload capacity when the truck is loaded with your big family and cargo.

My 2016 Chevy 1500 5.3 pulls 12-14k worth of flatbed quite well actually on flat ground at sea level. Add in high profile of a TT and it will pull about the same as your 9000lb TT.
I wouldn't want to do it at altitude or steep grades, but the truck will handle it. You won't be the first one to the top of the hill.
The best for sure choice would be a HD pickup for better stability, especially given your lack of towing experience, but properly set up I personally wouldn't have an issue with that trailer in the flat lands.
You don't "need" a diesel but they're nice! You can tell the wife you need one....

All I can say is "good luck with that"..

Does not matter what the specs are for that 1/2 ton truck you have... Ain't gonna be a comfortable tow and you'll be overloaded no matter what the 'specs' say..

Sure, you'll get down the road.. But it ain't gonna be 'fun'..

(how many different posts of this same question have you done? :) )

Mitch

Read the responses to your same posting in this LINK

I've towed for almost 40 years and "I" wouldn't do this for several reasons. What is the payload rating for your truck?