Trailers like
Scamp and Bolers need those posts to support the roof. However, the UHauls didn't have that type of support system needed. Because of the double hull construction, the ceiling support is molded into the inner hull. Check out the interior photo from original
UHaul brochure - No posts needed.
You can go to the gallery and look through various UH interior shots also.
Got any interior photos for us to
?