Thanks Deepmud ... from my perceptive, there is no right or wrong, it is what makes sense to each individual person based on there situation. That is why I design my trailers the way I do, individuals can build / tailor them to the way they want them.
Droid, the base dimensions are; closed - 56" x 48", open 56" x 84". The design of the MOAB Tent Units is optimized for trailer top mounting. There would be a few details to work out for vehicle top usage, mainly supporting the footend portion of the platform.