You should have no problem meeting your requirements. Getting a diesel has it's advantages, but for the same money you can get a much newer/lower mileage gas powered truck. You are not even remotely close to needing the extra power. When I bought my 04' GMC diesel in 07', it was a $6000 upgrade (all else being equal). Adding a diesel to a new truck now means an extra $8-9000, I expect the used market to be similar.
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)