Wider doors sure are helpful !!! At my age, I like to be able to sit at the door edge , and sorta ‘ just roll right inside ...

With the way you can build with foam , adding and subtracting , seems most anything (shape ) is possible !!!

You can see some of my earlier designs were more plywood based (till I learned the truth) but could be easily adapted to foam ...
The plans submitted above ^ was merely an attempt to produce as Simple a foamie trailer build as possible ... and not be just a “box” ...
Some observations .... for a simple camping trailer , the 4’ inside hight is Plenty of head room for most folks (allowing the use of full foam sheet sides) ... but the real key to Comfort is having the foamie wide enough !!! My little foamie is only 44” wide inside , and really not big enough for two ... 60” or more would have been Much better ... The idea of the Magic number of ~ 50 sq. ft. of floor space seems accurate ... for me anyway (@ 6’3” )