Welcome to the forum. I don't know what type of insulation is used in your Bounder.
Before you replace the roof, do a thorough inspection. Check all the seams and openings. If the roof isn't in poor condition you can use
Eternabond to cover seams or tears. Then the roof can be recoated with a rubber roof coating.
You may be able to get several years out of your current roof.
If you decide to replace the roof, use Eternabond on the new roof.
It will help keep it leak free.
Don't hesitate to ask questions, someone will have the answer.