You should be able to carefully pull that tape off the wall, clean it up, put some adhesive or contact cement on it and reapply it. If it's wrinkled and creased, wax paper and an iron on low will get it smooth and flat again.
You "MIGHT" contact Trekwood.com to see if they have the tape available, but I'd guess it'll cost more than you want to pay.
The venetian blinds are available at Camping World or from any RV parts department. They'll cost you about $100 per window... You can buy replacements at WalMart for $5.88 each, but you'll probably have to adjust the length to fit the window properly. Or, you could install pull down roller shades that will provide better privacy and block the light more efficiently, if you're a "late sleeper".....
I believe this is the link to your seam tape:
https://www.trekwood.com/products/12...-1-Sable-Putty Note that it's listed at $0.33/foot. VERIFY the price before ordering. They may well only sell it in 1000 foot rolls which is $330 plus shipping and handling.... MAKE SURE WHAT YOU'RE ORDERING FROM TREKWOOD AND WHAT SHIPPING WILL BE !!!!!