What truck specs for best fuel economy.

Was wondering if I could get a little guidance on spec'ing a day cab freightliner. Ive got a dedicated run from Southern Ut to Las Vegas Nv. (125 Miles, 1000 Ft elevation difference) Pulling 12 to 18K pounds in Van. Every once in a while a 45k pound load. Would you recommend a dd15 or 13?? My thoughts on rears are something really tall, perhaps 2:16 with the DT12 Overdrive running in 11th with 12th as an empty running gear. (I like running slow... 58 to 60 mph). Also... any opinions on the tag axle idea? Don't have any experience with them so looking for input from guys who have them and either love em or hate em. Thanks!

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