The curtains that come with the TT work very well at night and do a great job of blocking any light from coming in. For a more homey look, we added sheers that I purchased at JCPenney for about $15/pair. We purchased 5 pair of 24 inch long panels (10 total) and used 9 of them - 3 panels behind the sofa, one at each small window next to the bed and 4 across the front window. They still let plenty of light in. The curtain rods are the lightweight ones from Wallyworld and they are behind the curtains that came with the trailer with the rods sitting on top of their rods, ends pulled out as far as they will go.
For the front window, we purchased 2 hose ring guides like the one in the shower and attached one to each side at the bottom of the window. I sewed a piece of binding tape across the bottom of both the sheers and the trailer curtains so rods could be placed in them, then inserted the rods into the guides to hold the curtains against the angled wall to prevent the curtains from hanging over our faces. Below are some photos.
Here's a package of the hose ring guide and what it looks like (purchased at United RV in Fort Worth - check your local RV part store as they may be cheaper there than on line. We paid $1 each; online prices were $3-4 each plus shipping.)
Here's the guide in use. We used a nicer rod for the TT curtain as it sits in front of the panels at the front window.
And this is how the rods sit behind/on top of the installed TT curtain rods.