Towing kit advice help

Actually that sounds like a fairly heavy load. "People ain't light". Many older vehicles would be at their load limit with 3 adults and their luggage, never mind a trailer. That trailer EMPTY isn't all that light.

If I was "up to this" I'd want some beef in the suspension, GOOD tires, and probably air shocks for "some adjustability."

What does that trailer weigh? empty, and loaded?

It "ain't" just brakes, it's handling, as well.

And about trailer brakes........when you start to have a trailer that is a substantial percentage of the tow ing vehicles weight, you can quickly get into "bad deals" with no trailer brakes. A wet road, a curve, sandy / gravel spot on the road, anything that causes poor traction in a dangerous situation can quickly result in the trailer pushing you into a jackknife....and out of control. Electric brakes.........NOT surge........add some control to one of these situations because it keeps the damn thing behind you