Tby ...I'm in the same boat, but it appears you have been reading more than I have on it. I've done just short of 1300 miles in approx 18 hrs. Then I heard about the IBA..... I was like cool I can just send in my gas receipts then I read about it. Pathfinder is my inspiration and my friend Hoagy Carmichael or Hoagy's Hero's might be his web site he runs a few charity Cert IBA rides and has a few more coming up. Just had one ending this last weekend and it ad a 500, 1000, 1500 and I believe a 2000.
It's funny I think about it all the time I've done a few 500 mile runs this year and I'm going to do the SS 1000 soon. Maybe in two weeks which will be around Lake Michigan. Or I just mapped out a route out west to Mo and a loop home. The biggest thing is once I'm in it for 4-6 hrs mark I begin to wonder if I'm nuts or not. When I did the 1300 it really went pretty quick I believe making it a round trip was key for me. Knowing I'd be back home in my own bed. It was Chicago to just shy of Fargo SD and back. I did it on my Ultra Classic, I have purchased a FJR and set it up for LD. The best investments for me so far was a seat, cruise control, Nav system and a good stereo and Com system with Bluetooth..... Plus I just bought a spot. The big tanks for me I don't believe are worth it because I get sore at about the 175. -200 mark gas and stretch and I'm good. However riding at might and getting caught short of fuel can be a concern. The Garmin does give fuel stops and u can buy 30oz bottles.
Hope the thread takes off, there are so many Ld riders in IBA that are a wealth of info. Best wishes to you