Thank you. I may install something to aid in this..maybe miter some angle iron for each end. after the framing for my storage goes up all around the back of chamber, I don't think I'll need anything around the back. The front..might be a safe idea!
The axle is hard to see but the tandem fenders are there. they just arent pretty yet
EDIT: the back support you have in the diagram is about as high as my enclosed (soundly framed) storage will be all along that side. This is what I was planning to use for back support. What do you think?