When tying a mast down onto the boat, I would strongly suggest that you cushion the mast where it sits for example against the stern and bow pulpits, put carpet there as an example to keep the mast from scratching. Never leave any loose wiring, rigging, lines and so on as it could scratch, get caught on tree limbs, etc.
Now for that trailer I saw the boat on. YOU will need to move the straps a little further forward and backwards. What you will need to do here and I mean do this regardless what others say, you want those straps catching on something on top going backwards for example, the forward say around the forward cleats going backwards and the same for reverse. You are simply making sure the boat will not slide on the trailer in either direction. You see this all the time with the professionals and as a former dealer who moved boats as well, I know this to be important. If the keel is on a metal keel tray, if you can put foam, rubber, carpet or something under the keel to help keep it from sliding. I do not care how far you are going, you just have to think about the others as sometimes I had idiots pull out in front of me or tailgating. As for the straps, turn them a few times to keep them from slapping in the wind.