Is the pool of 4 down towable vehicles diminishing??

With the resale value of the Nissan Leaf so low, I was looking at getting one to tow around as a portable battery pack. It has a 20 some-odd KW battery pack. Could run the motorhome roof AC for hours at a time at night when dry camping and still be able to drive around national parks, etc. (in practice it won't work because the 12V converter can only put out 74 amps at 13.6V, 1KW which isn't enough to run the AC)