I rode a HD Tri Glide for 3.5 years. Now that is a beast to ride, the push pull of the handlebars to move the front wheel would wear me out after a day of riding. But I was able to push it through the curves by pushing hard on the handlebars to swing the rear end around. Now, the GL1800 is totally different. The HD does not have a rake to the front end. And depending on your trike kit, the rake will feel like power steering compaired to the HD. I have had my Gl for a year now and still cannot take the curves fast, this monster will get away from me if I allow it. So until I get used to the rake, I take it slower. Just remember several things, first you never have to put your feet down, watch out for the fenders when you pull up to something or in the garage, plus the gas pumps. When you get it back and its descent weather for you, take it to a parking lot and move it around, pull the handlebars to the right and to the left, get the feel of doing that to turn it. With the HD you point the fairing the direction you want to go, with the GL you have to use your nose....or your eyes, and your hands will follow.
You are going to miss the lean at first, then it will become muscle memory and you will have as much fun or more riding the trike. You will be surprised of how much of the country side you will see now that your on the trike. Enjoy, have fun and install some things to make the wife happier.