12 bolt true trac - how strong for towing.

[nm78bronco]

I have a 1976 GMC 1/2 ton 454/th400/2WD suburban that I want to rebuild the rear axle. I want to tow with it, up to 5000 lbs and want to know if a Detroit true-trac is as strong a differential as a factory open-diff for the 12 bolt factory rearend. I live in the Rocky Mountains out west, so long pulls up hills will happen sometimes. I would be using a 3.73 gear ratio with the true-trac.

Does anyone tow using a 12 bolt with a true-trac? If so, how much weight do you tow that you’re comfortable with?

Thanks