In April I renewed the insurance on my 10  year old truck (comprehensive) with Viriyah.  I sold off that truck yesterday and bought a new one that comes with a full coverage policy through the dealer (also with Viriyah).  Is it possible to cash in the remaining time on my old policy......I paid about 10,000Baht?  Anyone have any experience doing that?

Yes, have done that.

 

Check the policy, there will be a refund schedule.I would guesstimate you can get about 8 months or so back.

Yes, indeed.  I went to Viriyah with my old policy, my wife's ID (policy in her name), and her bankbook.  The agent canceled the old policy and transferred about 6k into my wife's account.  No problem.