Yes, a full size pickup would definitely be more stable. In addition to the wheelbase, they do weigh a lot more, especially ones like your F150 Supercab.
From what I see on the web for new trucks:
A 4x2 F150 Supercab weighs 6800# and has a 145" wheelbase.
A 4x2 F150 Regularcab weighs 4830# and has a 126" wheelbase.
A 4x2 GMC Canyon ext. cab weighs 3621# and has a 126" wheelbase.
Your Supercab won't be pushed around by an Elkmont, but the GMC Canyon weighs about the same as the Elkmont, and I imagine that can be felt, especially when it's windy.
At least the Canyon's Extended cab has a fair wheelbase, the same as a reg full size F150.
As for mileage, I'm not so sure. That's a big difference between a 6800# and 3621# and even if you had the same engine in each truck, those extra pounds must cost something in gas mileage.
I guess it's just a trade-off, like so many things, between towing stability obtained through a heavier, longer wheelbase TV and reduced gas mileage.
If the pickup was only used as a TV, then I would probably go the bigger, heavier route, but as this will mostly be used for other stuff, I'm leaning toward the smaller more economical pickup.
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