speeds you wont get run over by others.
This is such a horseshit argument. Lots of stuff towing/driving 65 no matter where you are in the country and I'd guarantee you that there are less accidents relating to towing at 65 than "getting run over" by someone passing you at 80+. Towing faster than 75 with a big trailer is asking for trouble since almost all trailer tires are max rated at 75mph anyway.
And yes, I don't give a flying fuck that your in TX or wherever where the speed limit is 80 and traffic allegedly always flows at 95. The majority of significant tractor trailer fleets are governed 65-70 for safety and fuel mileage.
I picked up a 99 Ford f350, 7.3 with a 6 speed manual for a tow rig. 285/78/16 tires. IDK what gearing. I picked it up to tow a 39 foot 5th wheel. I havent towed it yet. Weighs 13K pounds. I am a newb when it comes to towing. Question is will it handle the 39 foot trailer? Truck is bone stock.
Not sure what could go wrong here...
-No/minimal towing experience
-Tires too wide for the stock wheel
-At/over stated tow capacity
-39' sail in the wind behind a SRW truck
Can it be done? Absolutely! Use your head, leave space in front, accept that it'll be slow going, and work up to your comfort level. Throwing HP with tuners and mods would not be very high on my list given your circumstances.
I've got a 40' enclosed that's around 17k lbs with the Tacoma in it or about 14k lbs with the race karts. 2600 lb pin weight.
-Previous tow rig was a 2000 7.3 SCSB F250 with an auto and bone stock. Power was what it was, and you just took your time. Brakes warped all the time. Loud as fuck running under a heavy load all the time. Stability was suboptimal in big winds and the biggest reason I was looking to upgrade.
-New tow rig is a 2012 6.7 CCLB dually. Trailer is now zero event at all, literally can forget it's behind you on the highway with the cruise set no matter the wind. Never going to forget getting 17k started or stopped but it's an awesome highway cruiser. Wife even handles it fine as long as we don’t have to make many turns.