IIRC the 80 series is "rated" for 5,000 in the US. With the towing package. (All US models)
Everywhere else on the planet it's 7,000 or 7,500.
Why?
There are more attorneys in the USA than the rest of the planet combined.
That's why.
Attorneys and governments love to make decisions for the rest of us ignorant Neanderthal base creatures......
Go slow, stay out of traffic, leave lots of room, test your brakes out in the neighborhood with the trailer to get a "feel" for it, and promise not to sue anyone who says "you'll be fine".
I may have the record for 80 series towing. My 93 towed a 30 foot dual axle double slide-out travel trailer fully (very fully) loaded. 9,000 pounds worth. Pushed my OME 3" heavy J springs down a bit but not scary.
oK it was on my dad's property and I never got it over 10 MPH but that still counts, right?
Have to scrounge up that pic.....