I had a large TC back in the 80's when I'd never even heard of small generators that you could find room to carry with a TC.
I'm in the process of doing solar on my smaller 26' TT (which is really just an overgrown TC) but I'm going to put 400W up there.
You may want to avoid roof penetrations and are therefore only doing one stick-on panel - I urge you to do more if you have the room. 100W is going to no doubt help, but 200W will be a whole lot better (twice at good, eh?).
I have nothing against generators other than the hauling of them and the gas that takes up room, especially in a TC. Try 200W up there before you spend money and room on a generator. And, when the panels are being installed, you might position them to see if there's room to install a third one later.
Bill