I may be wrong but I'm sure airlines generally pre plan their diversions..usually as stated to other bases where they operate from.Hence the fuel uplift is pre arranged before departure to take diversion into account?
DTV is at a major disadvantage in that they have limited facilities exacerbated by frequent ATC closures,limited AFS cover(although not being notamned at moment?) and airport opening hours. Probably taking all into account not the best planned diversion airport?