I have a 2002 Jimmy- I trailer a 20 Foot Fiberglass Walleye boat Tracker- same as a Ranger 619 with a 150hp- No Issues.
Your engine is a little heavier but not much.
But hey- if you need to buy a new truck--- Avalanche does the job real nice- my buddy tows his Ranger 521 no problem.
I believe the Tracker Marine Shop at BPS has them or will install
I call BPS before the thaw looking for an auger and was told they were completely sold out- Went to the store late in the day - they had maybe 200 of them
I bought it from Le Baron instead- I get better service from the small local dealers and most of the time the price is the same or lower