Over the years, I towed several < 5000 lb trailers: Coleman 18’ and a Dalton Apache (don’t ask). I had a V-6 Isuzu (remember them?) and an F-150 with a 302. Both were rated to pull 5000 lbs. Both failed miserably. Overheating was the main problem. Even with a cooler. The other issue was stability in the wind. The new engines are more efficient. However, add in the mountain roads, the thinner air, and the desire to go over 45 mph. If you can afford to do so, get something with more towing power. You’ll be happy you did. i ended up with a Ford Diesel. I also keep things a long time. So, its 17 years old with 480,000+ miles on it, tows up to 12,000 lbs (although I won’t). We have a 5300 lb trailer plus everything on earth inside. I can tow it fine, and it’s stable. Good luck. Let us know what you decide to do.
2003 Ford F-250 7.3 (476,000 miles)
***Closing in on one half million miles***