Theoretically the Offy would be better for your application as previous threads have stated it is better for low end power than the Clifford.
In my opinion, if you have a v6 version of the T-5 you should be ok pulling a light trailer behind the Chevy II, especially if you put some lower gears in the differential. Many have pulled small trailers with S-10s and Astro vans without difficulty. Do not know what your other plans are, but front disc brakes and at least an 8.2 five lug rear may make it a better tow rig and hopefully your trailer has brakes on it.
