travel trailer weight

4K loaded you should be fine. We towed a similar weight with a V6 4Runner with the same engine. It will down shift and rev up when required to get into the power band to pull hills. People get nervous about this but it's normal and won't hurt anything. That powertrain is bulletproof.

Thanks to all - I'll learn as I go.

I really appreciate all you help and info.
I'm just a maverick at this but I'll be learning as I go.
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If 4000 lb is your loaded weight, and your tow rating is 6500, you should be fine. Even if you put 1000 more on the trailer you will be at 5000 with 1500 to spare. General rule of thumb is to stay below 80 percent of your tow rating and you are well below that.

You will need a good weight distributing and sway control hitch. A Blue Ox Sway Pro or Andersen should serve you well.

Just get in the right lane and take your time. That's what the right lane is for. If you have tow/haul mode it should help. Read up on how it works in your vehicle. Otherwise shift down for more power going uphill, and go down a hill in the same gear you came up. Let the transmission hold your speed and do not ride the brakes.

Rving is RVing. Yes it is great to have a well matched rig that takes the mountains in stride. But if you do not, you do not. Asking the board is a good start as it is always best to find out first.

I did not know what my old 200 hp. F-150 would do so I rented a 25 ft. TT similar to what I was going to buy and took it to the Ozarks.

Yup it was a challenge, slow and steady. But we learned that to pull the 6000 lb. loaded TT we wanted, we need about 350 hp. The 200 hp. would not have worked well in the Rockies.

We bought a new TV before we bought the TT. The E-boost does just fine in the Rockies.

Renting and driving beats all the theory, that is for sure.

Don't forget about everything you add to the truck and trailer that will add to the 4000. fluids, luggage, food items, etc. A Tacoma isn't too hefty. Most main roads don't have super grades; however, I encountered a blacktop in Colorado with my half-ton Chevy towing a 25 ft. 5th wheel. Had to go to 1st gear and I began to wonder. Try to weigh your trailer fully loaded and see how it compares to the 6500.

I see you're in TX. Thats pretty flat for the most part. Head winds will kill the fun. I live in Oregon. Lots of hills and mtns to climb and descend. Towed a 4050 lb TT with a Nissan Frontier V6 AT. Pretty much the same HP/TQ ratings. Handling was fine. Power part sucked. Flats were fine. Small gas tank and 8-9 mpg really hurt longer distances. TT was 7'6"W x 9'9"H x 22' OAL.
I traded up to an F150 and what a difference. MPG went up as well to 10.5.
If you're the slower laid back barely do the speed limit type of driver them you'll probably be fine with it.

thanks for the helpful info. will have to stay off those steep climbs.

and....is the 4000 lbs. the "dry" weight or the loaded and trip ready weight?

(I guess I'm slow today with my questions/help)

That's my opinion too, Donn. Won't be fun. OP is not specific as to TT weight. Is that 4,000 pounds loaded, wet and ready to go?