Help with Possible Upgrade to 5th Wheel

I’m considering upgrading from my 2014 Heartland Trail Runner 27RKS to a 2018 5th wheel. My TV is a 2015 2500HD Doublecab Gasser with the standard 6.5 ft. box and 4.10 gears. I’ll be keeping it so I understand I’m somewhat limited and will have more difficulty in mountainous regions, have less torque and worse fuel mileage than a diesel would provide. I can’t afford to upgrade truck and trailer at the same time because my DW and I have both recently retired and I have no interest in buying either truck or trailer used as a compromise. I’m looking at the Forest River Flagstaff 524RLBS or it’s sister the Rockwood 2440BS. It’s one of the lighter 5th Wheel models I’ve seen with the floorplan I like. It's weight specs are similar to my Trail Runner that I have no issue towing. The 5th Wheel also comes with the Reese Revolution Pin Box as standard equipment which claims that a slider hitch wouldn't be necessary. I have no clue on whether this is true or not. I’m thinking my 2500 will tow it just fine but I’m looking for the expertise from the members of this forum.

First, what is the overall opinion of Forest River 5th Wheels in the Flagstaff and Rockwood brands and do you see any red flags for me to consider before trying to negotiate a deal?

Here are the Specs
Flagstaff 524RLBS/Rockwood 2440BS
Dry Weight : 7,226 lbs., Payload Capacity: 1,854 lbs., Hitch Weight : 1,080 lbs.

2015 Chevy 2500HD 4X4 Doublecab 4.10 gears

Max towing weight 17,900
GCWR: 20,500
Max Towing 5th Wheel/Gooseneck 14,200Lbs.
GVWR 9500
GAWR FRONT 5200 GAWR REAR 6200
PAYLOAD 2892

Current Trail Runner ratings

GVWR: 9000
GAWR: 4400
Cargo Limit 1698

Thanks in advance for your input.