The weak point on any 12v heated blanket or mattress pad is the plug. I haven’t found one yet that holds up over the long term without getting too hot. We have one of the old Electrowarmth brand queen size 12v mattress heaters, and after trying 3-4 different style plugs on it, I finally hard-wired it to its own resettable CB. A small pad or blanket might be ok.
The Electrowarmth pad itself is great, and I like the old style analog control with no shutoff, but I think they were pushing the amperage limits of the 12v cigar lighter plug with that size pad. That’s probably why they don’t make a queen size any longer.
:):)