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I have an 04 Yukon Denali with a 6.0...it is rated 8000 lbs pulling

Nice, you'll be fine

I'm going to wager a guess that you'll weigh in around 7000 lbs.

I sure am hoping! Just had transmission serviced and got a new set of tires. The only problem now is the calendar

Well now.........I was looking at some pics of my soon to be new boat and I THINK...A swing away tongue isn't going to be much help~~~
I'm thinking the tongue is going to be too short~~~

Yeah looking at that pic...doesn't look like there's much space between where the frame rails come together and the coupler. You could always extend the tongue first, then add the swing-away to get it back to the original length