I tow heavy, so take my comments that way :)
If you do not have transmission cooler, you can (and likely will eventually) glaze the clutches and/or'burn up' your transmission.
Go slow. 50 mph is a good number. It will fade from 45-60 depending upon terrain and traffic. If you're not in a hurry, you'll be happier!
Leave plenty of room on all sides as you drive. At leasat triple the braking room, an 'escape route' when someone cuts you off- and they will when they see that beautiful space you are keeping for safety.
Of course, WDH.
Hauling at or near max is not to be taken lightly. You will notice your inexperience. Do you have the chance to tow something lighter and SHORTER first?
An open cargo trailer or something like that where you can see OVER the trailer...maybe in the range of 16ft or so would be helpful.
Seriously. Borrow one if you can. You WILL learn and be happy you did ;)
I've been towing loads of all sizes for over 40 years. Take the 'payload' discussions as educational and definitely pay close attention to tips and cautions about handling, backing, etc.
It's like anything else. Go slow and use an abundance of caution when starting out. Call on an experienced buddy to guide and train you in a parking lot if you can. Fortune favors the prepared.
