I no longer own drift boats but I didn’t separately insure them when I did own drift boats. However, my homeowner’s insurance policy with State Farm provides (I think) something like up to $1,000 coverage on a ‘watercraft” category. I believe that most other homeowner’s insurance company policies have a similar protection. That amount is all inclusive to include items like float tubes, oars, life preservers, etc., in addition to an actual boat. The personal property coverage extends worldwide no matter where these items may be located. Beyond that, I believe you’d have to have a specific policy to insure coverage on a boat.
I look at insurance as providing protection on what I can’t afford to loose, not on what I can afford to loose. I always felt that I could afford to loose (say) $10,000 on a drift boat. What I couldn’t (or wouldn’t) want to loose, however, might be a potential multi million dollar liability if someone that was in my boat drowned and sued me. So, I do have a separate blanket liability insurance policy. Those are relatively inexpensive, and I believe that State Farm sells them in million dollar increments.