Will it pull my trailer?

I have to chuckle a bit when reading these threads about "is it enuff truck?" For years I towed 24' TT's with a 1/2 ton 1965 Chevy Van (flat front, flat windshield, engine between front seats). I installed a 292 inline 6 cyl motor with a TH350 trans, headers, HEI, 2 bbl Weber carb. The 292 is a low revving tow monster with tons of torque, they were used in wreckers in the early '60's before big block v-8s came along. Step on the gas it just starts out with a low rumble and goes thru the gears very steadily without making a lot of racket. We towed all over the western USA up and over Cascades & Rockies for 90,000 miles worth, got 10 mpg towing and all of 13 mpg running solo. Based on all that I read here it shouldn't have been able to tow fully loaded with 5 people and a 5,000 lob TT, but it did, and still does (still have it). I've since towed with an '88 454 Suburban and a 2005 Roadtrek motor home (3/4 ton Chevy Express) with 6.0 which did better than the 454. Now towing with '94 Suburban with 350 that has to rev high, much prefer towing with the old van but it doesn't have A/C so us oldsters had to go with something newer with A/C. It's a 1/2 ton 4wd but does great with a 5500 lb TT loaded. 9.5 to 10 mpg towing, never better than 13 solo, but I don't care, love driving it.