Whats pulling your RPod

It isn't just the engine. It is also the transmission, differential, and final gear ratio that affects mileage. Aerodynamics also play a part. I tow our R-Pod with a 2010 Nissan Frontier Crew Cab LE 4x4. One thing that will make a big difference is on uphill climbs. If I try to maintain speed and let the transmission downshift so that the RPMs exceed 3,000, I will get single-digit mileage. Turning cruise control off and turning overdrive help as cruise control will downshift the transmission and I will find the engine hitting 4,000+ RPM.

One other thing that can help is to get a wind deflector such as PurpleLine USA's AeroPlus or Icon's AeroShield. Either one when set up will help. Limiting your speed to 60 mph or less makes for a more relaxed drive and for better gas mileage. Air resistance does not increase linearly with speed but exponentially. See this site for an illustration:  http://www.mpgforspeed.com/

The trailhawk optional engine is 3.2L V6 24 valve.  It is 271 hp and 239 lbs torgue.  We have taken our 180 by accident over appalachian mountains where there are signs warning no trucks and she did just fine pulling the RPOD.  Having the break controller helped on the way down and did not even feel we were being pushed

Very interesting. We have the same setup and have been getting 17-18 mpg.  That's according to the car calculator.  Of course we are driving slow trying to keep it 58-60.  But have gone up to 70 when road conditions are perfect and wind is on on backs.

2016 Jeep JKU. Four door,4wd,auto transmission. Pulls great on the flat,gutless on hills.

I use a 2004 Land Rover Discovery, 150,000 miles.  I live in Colorado so I frequently pull over the mountains.  I don't go fast over the passes, but 60mph up hill is doable.  On the flats I can get around 15 mph if I am careful, but worse in the mountains.  My truck isn't exactly stock: heavy duty, taller springs, large offroad tires, etc.  Generally without a trailer the truck is over-sprung, so it handles the trailer well.  The engine is a small block V8.  Generally I drive very gently while towing and the R-Pod tows incredibly easily.  I don't have a weight distributing hitch, trailer has towed dead straight without one, even on a windy day in the Colorado mountains (it blows pretty good up here).