Proud new owner of a rpod 193

I'm not sure if a Ranger would be adequate for you. It is a 3500 lb capacity unless you get it with the factory tow package. That boosts the towing to 7500 lbs. The restriction of 55 sq. ft frontal area must be considered also. The height x width of the RPod 193 is about 79 sq. ft. Whether the slope reduces this figure to within the limits of the 55 sq. ft. for the Ranger is a question for an engineer. The engine is a 2.3L Ecoboost engine. I was towing an RP179 with an Escape with the 2L Ecoboost engine. The Ecoboost engines are remarkable. The caveat is that you will need to use premium fuel for it. A lot depends on fuel tank size also. We were stopping every 100-150 miles to fill up with the Escape. We are now towing with an NA 4L V6 Frontier. The Ranger comes with an 18 gallon fuel tank. That is better than the Escape, but not as big as the Frontier's tank. OTOH, the mileage figures for the Ranger are better than for the Frontier, but those do not take into account towing. Figure on about half the stated mileage for when you are towing. That is, if you limit your speed to 60 mph or lower. Faster will have your mileage in the single digits very quickly.

The Colorado does (IIRC) have a Diesel option. I think that would be pretty good.