I understand your situation. Trying to pull a TI back on to a trailer from a boat ramp can be difficult for one person depending on the angle of the ramp, your physical ability and the tide.
Sometimes when I come back from sailing I just anchor my boat in about 3-4 feet of water, then put my Appel Cartviewtopic.php?f=73&t=35157
in the water, under the bow and slide it back towards the middle section (the balance point). I then strap the boat down, pick up my anchor and roll the boat out to some place where it's more level. Once I get back it to my trailer, I will sometimes use a block and tackle to assist me in getting it back on the trailer.
If your going to go it alone with your trailer on a ramp, having a stern roller or a saddle placed on the far rear of your trailer will help catch the bow, and then the rest is (somewhat
I also have a bow line attached to my forward crossbar which I sometimes use if there's cross winds. It's long enough that I can attach it to the stern to form a long loop. This gives me even move control. It's like having someone guiding the back and front of your boat.