1500 0r 2500 gasser

So I live in Washington I have a 2024 Chevy 1500 RST 5.3 with 24000 miles just bought a camp trailer. It’s 4100 pounds dry 6000 pounds max payload I get about 15 to 17 mph just normally driving I get about 10 mph towing. I tow maybe 5 to 7 times a year maybe a little more should I get the new 2026 Chevy 2500 6.6L with no cylinder, deactivation or active fuel management or stay with the 5.3 and worry about the cylinder reactivation stuff going on