Your long bed/ wheel base will ride better than a short bed. Then again the short bed/ wheel base will fit into parking spots better. Pick your poison :B
OBTY all diesel fuel at the stations is #2 now days with additives for winter in the snow belt, and Bio this time of year. As many posted the Bio can vary but it will not hurt your engine. Actually Bio has a better lube quality and actually help your injectors and pumps. Maybe debated by some but the proof is in the puddin. I believe all the big 3 engines allow 20% bio fuel as of 2015.
Those apps are great most of the time, ITMON they really suck :B