A 7200 lb 5th wheel would be fine behind a 1/2 ton IMO. 5th wheels handle much better than travel trailers. Power wise most all 1/2 tons have the power to pull that easily. Payload will be the harder part. You'll need to look on the trucks door jamb for a sticker that shows the Cargo Carry Capacity. The brochure weights are not the same as the actual door sticker weight.
Right now I think the best option is a Ford F150 with the 3.5 Eco motor and the Max Tow package. Fords seem to have higher CCC than Ram and Chevy.