I check it everytime I change the oil (3k), and have never had to add any in 12k miles.
You don't say what year your bike is, but with the LTDs - the tank is under the right side of the fuel tank.
You can look up at it with a flashlight from the front to check it. Next time you have the tank off, or if you can reach up in there - make a dark mark across the "full" line of the tank with a black Sharpie. That makes it easier to read from the bottom.
If you are going to add coolant - make sure the container is labeled "mixes with all brands", or you could end up with issues.
Stay away from Dexcool (Dexclog).
Don't sweat the petty things . . .
Don't pet the sweaty things . . .