There's a very simple work around for getting a UTV street and trail legal.
First (and this step may net even be required, check with DMV), you need to establish a business (best bet would be landscaping, IMO). It's not really that hard, see:
http://www.nolo.com/legal-encycloped...hampshire.html. The business does not have to ever really do anything, it just gives you a logical reason to have construction equipment to register.
Next, register the UTV as Construction Equipment for the business, this will get you plates and give you the right to operate on the streets with the same regulations as something like a backhoe.
Finally register the UTV as an OHRV so you can use it on trails.