First off-congratulations on coming here before you bring out the wallet and possibly make a mistake. We're all pretty knowledgeable about RVing (just ask us).
We drive a Ram 3/4 Hemi 6.4, and pull a 30 ft. 9995 lb trailer. Money well spent on the tow vehicle! Most 1/2 ton trucks just don't have the "guts" in most cases to safely get under a longer unit. They have the power, but tires, brakes, and suspension is usually light weight.
It seems the majority on here are making the case for more truck, and I have to agree.
One last note; don't always believe the sales person!!!!!!!!!!!!!!! They're job is to move units.