Being a Winnebago, and 30 amp, I'm going to assume you have a Parallax/Magnetek power panel, and the very best converter you could install would be a Progressive Dynamics 4600 series unit (last two numbers would be the amperage, ie. 4635, 4645, etc. which will come in a new mounting box, exact fit in the place of the old one, and a new 12v DC fuse panel. These are multistage units that will bulk charge the battery at about 14.2v and then drop to 13.6 and when the battery is topped up, it will maintain 13.2 and not cook the batteries.
Best Converter
Pic is of my Winnebago View (sold) converter (with metal front and door removed) and I later converted my Bigfoot trailer also.
Charles