Welcome to the forum and congratulations on retiring, the trailer and the truck.
Questions like this come up frequently on this forum. The issue most often comes down to the PAYLOAD of your truck (printed on the sticker on the drivers-side door jam) and all the people, dogs, and stuff in your truck cab and truck bed, plus the tongue weight of your fully loaded trailer (to estimate tongue weight, take 15% of your trailer's gross weight).
Most often it is the vehicle PAYLOAD that is a tow vehicle's towing limitation. As far as I know, no one knows how vehicle manufacturers arrive at the 'towing capacity'.
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18
2006 Ford F350 PSD, 4WD, CC, LB, SRW, Cmpr. pkg, Equal-i-zer 4-p, Continental ContiTrac TR