I modified my trailer (And my boat, but eye's are put on the stern for the purpose of strapping) so I can use two transom ratcheting tie downs. The winch gently holds the bow, and I use two more ratcheting tie downs on the front side d-rings.
Learned a long time ago "I am only going to tow a mile" just isn't safe as the rear of my boat bounced a foot off the trailer. If it moves anywhere but a parking lot it is strapped bow and stern PERIOD! Also learned bow straps break so redundancy is good.