I have used Eternabond tape many times, just remember that it does not like to adhere to Silicone. If you have silicone sealant I suggest you use a heat gun to soften and remove then reseal with a non silicone caulk and cover with Eternabond. You must use a roller or other device to properly seal the Eternabond. I suggest a wooden wall paper roller for best results.
If you are re-sealing the gutter where your roof fits in then I recommend you go on line to Lichstin's web site and review their U-Tube video on how to do this. They give very specific instructions on material depending on your MH's paint etc.
Good luck, hopefully this helps.
Former RV Manager
2004 Four Winds (THOR)