Next year (late mid-to-late March or early April) Ms. LincolnJKC and I are considering taking a road trip of +/-5 days from WAS (Picking up at IAD ideally since that's where I'm flying in to pick her up but DCA or Union Station are also fair game) to MIA -- or MIA-WAS so she can catch up to my state count and see some of the Eastern seaboard she hasn't before (in addition to burning off some travel vouchers, etc. -- and ideally burning down my Gold Plus point balance in the process)

The pickup/return dates and length of stay are almost completely flexible. Before drive myself crazy by trying every permutation of pickup and return date and location over a 60 day period is there some way to "shop by calendar" either on Hertz's website that I haven't found or one of the OTAs that provides this feature ala airlines (at least United) and hotels (at least Hilton)?