Funny how Cannondale/Garmin don't use them.
If you wish to train wisely get an on line coach, not Vectors, the price will be about the same.
I married a coach but all I got was 42 seats!
Unfortunately I completely lack the discipline you good cyclists employ. Two young kids don't help either, although I am really just scrabbling for excuses. Ask me to fit a kitchen or build an extension, I'll stay the distance and complete the task in good time, (although don't ask Mrs. Miggins for a reference), but ask me to train properly for a serious event and I find the path to success littered with Coors Light, pizza and an unparalleled lack of commitment.
That said however, a more content and happy man, you will struggle to find. I also do have a caravan, but the wife bought it off Facebook, and you would struggle to find a less attractive example of towable abode. Even if you did manage to get over the faint fishy smell within, when it rains, position yourself incorrectly and the drips become quite torturous.
I am really looking forward to the triathlon circuit this year, as it will be our first proper year in it, by the end of which if I haven't managed to talk the wife into upgrading it, it will probably mysteriously catch fire.