I agree that the "Jeep" version is sturdier but I am not sure how often it matters. I have a QS6 off-road that I pull with a Jeep Willys. I have spent quite a lot of nights in Utah, Arizona and California. I am leaving soon on a 4 month vacation from South of New Orleans to Arizona, Colorado, Utah, Washington, and Wyoming. To date, I have never found a place that I could not take my QS6. I have forded 36" desert streams and boondocked for ten days at a time in the mountains of southern Utah. If I feel safe taking my jeep there, I do not think about my QS6.
The most amazing thing is that my QS6 looks brand new. Except for the bed, there is really nothing to wear out. I replaced the mattress and installed foam block floor.
I have looked at the "Jeep" version but have no need to upgrade. I do like the looks of the Extreme edition but I also like the look of green in my wallet. I have no regrets with my QS purchase and recommend it to anyone looking for a small off-road trailer that is comfortable and can be used solo.
Michael