Hmm… I really like the Ram Truck too, our son in law owns one, very nice rig! But, gas trucks on long uphill hauls being hated. Lets take a look at this video and see if it that holds up to scrutiny, albeit the sideline whoop di la is a bit over the top.
http://www.ford.com/trucks/f150/gallery/videos-and-demos/all/uphill-towing-battle/FMFS8536000/
FWIW, I've never, not once suffered the upload slug with our gas truck (3.5 Eco Boost), in fact we tend to pass quite a few other rigs on the long grades in high altitude. Just finished a two week trip in the SW for the second time with mesa grades from 5-10%, nary a problem. Its a zippity do da affair over the hill. Regardless Jaquelyn for sure should hang onto her existing rig, it will be more than adequate for the task.
Hope this helps.