I have using DesignCad 3D Max since it started in mid 1970s...use to be call ProDesign.
Costing much less than AutoCad. I am very please with it. I have AutoCad at work before retired.
Here an old drawing plan of Sojourner...still may change some whenever it ready to inside work.
Has two slide out....not shown bed being out in drawing.
Side view is new tubular framing widen to 8.5 ft, raise 8.5 inch, rear extended 30" and front extended 8" so door opening is 36" wide
FWIW
Sojourn for Christ, Jerry