I am certainly not as experienced as some on the forum but here are a few observations . A crew cab with a 10 ft bed is going to be one long truck and if the camper is set to the back it will have the COG in back of the axle . If you really want that set up look into a cab/chassis with a longer wheel base . There are some other advantages to a c/c . The rear rails are narrower and standard for after market beds . They usually come with heavier suspension than pickup models . On a dually the rear axle is 4" narrower than the pickup . By removing the front wheel spacers you have the same axle widths front and rear as a SRW truck and can use aftermarket wheels and tires ( converting to singles).DRW cab/chassis usually come with a second fuel tank . Keep in mind approach and departure angles . Good luck
