I had a 2008 Mercury Mariner hybrid that I towed for over 30,000 miles and now tow a 2012 Ford Fusion hybrid. As has been already stated, Ford hybrids have always been towable since the 1st Ford Escape hybrid was introduced in 2006.
They require no fuses to be pulled or battery cables to be disconnected - - and the fuel economy is great (except in cold weather as has been noted). Battery replacement is probably not an issue as they will last much longer than the warranty (8 years/100,000 miles). They are designed to operate under low stress (never allowed to fully charge or fully discharge) so that leads to longevity.