Hi Warren, i don't know if my comment will help you.
When i had my 30 inch dob built a few years ago i had an enclosed custom made box trailer build with half the roof able to tilt at 45 degrees for easier access.
It has a 9 foot fold down ramp to wheel her out.
I suppose the point i'm making is it may be cheaper to have one built to your specifications than the hassle of modifications?
Hope it helps,
regards,
Peter.
