Towing kit advice help

I'm looking to tow about a 5x8 uhaul style cargo trailer. I have a 3 piece band so not much equipment and maybe a few merch boxes. I'll be carrying 3 people, 4 total and our bags in the trunk for small weekend mini tours throughout SoCal. I've seen several pics of a-bodies towing other cars and boats so my tow demands should be fine right?

With all that being said, my 74 dart sport already has a hitch on it but it's small and it's not bolted to the frame at all. But I do have a mild 318-904-8,3/4 limited slip (3:55), and front discs..

What should I do to safely tow our equipment with peace of mind.. Lol anyone have pics of their setups I can see? I'd like to avoid welding. I don't plan on towing anything else either.