Welcome to the Gulf Stream Owners RV Forum!
We are glad to have you join us and look forward to your joining in on some of our discussions.
As far as relocating your rear jacks, It would probably be quite an undertaking since all the hydraulic hoses would have to be moved and if the holes are not in the frame or as on our coach there is a mounting plate for the jacks that is actually welded to the frame.
You don't mention the chassis you have. Maybe that would help some with a recommendation. SunVoyagers have been built on several different chassis over the years in diesel and gas. You can put your chassis info in you signature like I have then it will always be listed on every post.