Re: Retro MTB Touring.
Going back to OP, I think some are forgetting that this will be his first "tour". If you are going to a popular area then I can't see the advantage of camping if you don't have any camping gear suitable.
If you make the first one you try as fun as possible then you'll get to know whether you like the touring idea without a big outlay on stuff you might not need again. Having as little weight on the bike will keep decent handling and it will be easier to ride a longer distance. A stop in a B+B will be great recuperation for the second day, especially important if a first time tour as riding a long distance on a second day might be a new (read difficult!) experience. A nice bumper breakfast will fuel you up for the day too. One night in a B+B won't be much more than a camping pitch plus the breakfast you'll have to buy.
If you catch the bug you can build up kit and knowledge on what you like to pack, how long to ride etc on every tour you do. You might eventually graduate to fully loaded touring accross deserts!!
I'm planning on doing the C2C this year and that'll be 50-60 miles a day over 3 days. As its my first multiday ride I'm going for a B+B for 2 nights as it'll only cost £80 ish in total and make it much more pleasurable. I'll be able to travel very very light to make it feel more like a day ride.