Don't know where to start

I have been looking around for a while now trying to come up with a plan for a build. I need some thing that will hold all four of us, be light enough to tow, and still have enough room inside to keep the wife happy. I found a camper from Forest River that I like the idea of but would want to change it a bit. I'm not very good with designs programs, I'm a building not a thinker lol. I would want to leave the bathroom out of the unit I build and move the kitchen from the inside to the garage area on this unit. That would shorten the unit up and the lack of a bathroom would really lighten the load. If anybody has any suggestions or is good with design work and wants to help a fella out I would appreciate it. Here is the link to the unit I was referring to.
http://www.forestriverinc.com/TravelTra ... rettyPhoto
http://www.forestriverinc.com/TravelTra ... rettyPhoto