We tow our Scamp
5er with a 3.0L V-6 Ranger, and have taken it up ovet the continental divide a few times. It doesn't power up the hills, but it gets there and provides decent fuel economy.
A couple thoughts on our setup. First, I do wish we had just a bit more power, but where the Ranger really can't keep up is in the transmission setup, which is common to both the 3.0L and 4.0L engines. If you tow uphills with a Ranger, make sure you add an after-market oil cooler into the mix.
A second thought is brakes
. Fully loaded, our TV/Trailer combo rides right at our Rangers gross combined vehicle weight
reccomendation (GCVR), and I've noticed the brakes
have started to "pulse" a bit, probably due to overheating and warping the brake rotors and drums while braking with the trailer. Before I buy another truck, I will make sure I know what it's actual GCVR is and make sure I have a bit more headroom after adding in the weight
of my passengers and gear to the truck/trailer combo.
Another thing to check is whether the truck you plan to buy will fit under your trailer. You can only lift a trailer so much before it becomes both a home on stilts that requires a stepladder to get in and out of and an unsafe, top-heavy trailer to tow.
Finally, I'm hoping replacing our pickup can wait until there are some small diesel pickups available. The Chevy Colorado/GMC Canyon is supposed to get a 4cylinder diesel in the 2015 model year, and should get great fuel economy and be more than competent for enough towing our trailer.