Okay, I needed to post about this, and I see you posted on my build journal already, covering some of my question. I pulled your quote here so that I'm not filling my build journal with questions though. You comment about brackets over the axle was:

Fender (1) by jseyfert3, on Flickr

Fender (2) by jseyfert3, on Flickr
Yup, that's right. I forgot about the damn tires.
Didn't help that I didn't have them mounted, if they had been mounted I think the problem would have slammed me in the face while I was measuring. I didn't entirely forget about them, I used the model, determined that the fenders would fit nicely between the 1x4s as planned...when I was planning 2' center to center spacing...
Therefore, I'm left with three options. First, move the brackets around. Second, put in a crossbeam over the axle, screwing it into only the brackets and the floor. This crossbeam would only be able to extend the width of the steel, so it would be a floor support only and would not support the edges and hence the TD, but that probably wouldn't be an issue. Third, put nothing there. I don't like that because that leaves a 3' span, which holds the bottom half of the bed. The bottom half of the bed is not where most of the weight is, but that's still a long gap.
I'm leaning towards option #2, I think the TD itself has plenty of support without the beam, so the beam would be just to support the floor there. It also will be needed to support the battery, which I planned to do an underslung mount just forward of the axle, and possibly my AC, which I'm still considering to mount in the same manner. Do you see any concerns with the beam over the axle just supporting the floor and being one of the battery/AC mounts and not running to the edge, and hence supporting the walls and the 1x4 that runs front to rear? I don't see that being an issue, I just wanted a second opinion.
What did I learn? Keep pushing forward, just make sure you measure when all relavant objects are in place or at least take into account there future presence. Good news is that this is a fairly minor mistake that shouldn't cost any money or much time.
As a partially related observation now that I popped the fender on to measure, I realized that the outer part of the fender sticks out 7.75" from the edge of my frame, which means the outer edge of the 1x4 that runs front to back will be 9.5" out from the edge of the steel, which means my trailer width will be a mimimum of 5'7.5" width, just slightly wider then the 5'5" I was planning for, but it also means I couldn't shrink it by using say, a full XL bed (7" narrower then a queen), because there is the space of the tire + clearance you have to build either on the inside or outside, unless you aren't running a 1x4 the entire length front to back, which would mean a more complicated build. This is not, however, an issue, just a comment. 5'7.5" is find for the width. However, it also means I have to make sure that a 1x4 covering the upper outside of the fender leaves enough room to mount and remove my tires. I believe that is the case but will measure once I get my bearings and seals and get the hubs assembled and placed on the trailer. Then I will mock up the 1x4 on the edge of the fender and try removing/mounting the tire.
However, before I saw this, as I was falling asleep last night, I realised I had done something wrong. The brackets I had not mounted almost directly over the axle where to hold another 1x4 to keep them at 18" center to center spacing. Look at these pictures and see if you can tell where I messed that up.KCStudly":3sao9dvm said:You could leave out the brackets at the axle mount. You have plenty of anchor points with the rest, the wood side rails will tie that xmbr in, and it will be bearing on the steel anyway. IMO, Skip it.![]()

Fender (1) by jseyfert3, on Flickr

Fender (2) by jseyfert3, on Flickr
Yup, that's right. I forgot about the damn tires.
Didn't help that I didn't have them mounted, if they had been mounted I think the problem would have slammed me in the face while I was measuring. I didn't entirely forget about them, I used the model, determined that the fenders would fit nicely between the 1x4s as planned...when I was planning 2' center to center spacing...Therefore, I'm left with three options. First, move the brackets around. Second, put in a crossbeam over the axle, screwing it into only the brackets and the floor. This crossbeam would only be able to extend the width of the steel, so it would be a floor support only and would not support the edges and hence the TD, but that probably wouldn't be an issue. Third, put nothing there. I don't like that because that leaves a 3' span, which holds the bottom half of the bed. The bottom half of the bed is not where most of the weight is, but that's still a long gap.
I'm leaning towards option #2, I think the TD itself has plenty of support without the beam, so the beam would be just to support the floor there. It also will be needed to support the battery, which I planned to do an underslung mount just forward of the axle, and possibly my AC, which I'm still considering to mount in the same manner. Do you see any concerns with the beam over the axle just supporting the floor and being one of the battery/AC mounts and not running to the edge, and hence supporting the walls and the 1x4 that runs front to rear? I don't see that being an issue, I just wanted a second opinion.
What did I learn? Keep pushing forward, just make sure you measure when all relavant objects are in place or at least take into account there future presence. Good news is that this is a fairly minor mistake that shouldn't cost any money or much time.
As a partially related observation now that I popped the fender on to measure, I realized that the outer part of the fender sticks out 7.75" from the edge of my frame, which means the outer edge of the 1x4 that runs front to back will be 9.5" out from the edge of the steel, which means my trailer width will be a mimimum of 5'7.5" width, just slightly wider then the 5'5" I was planning for, but it also means I couldn't shrink it by using say, a full XL bed (7" narrower then a queen), because there is the space of the tire + clearance you have to build either on the inside or outside, unless you aren't running a 1x4 the entire length front to back, which would mean a more complicated build. This is not, however, an issue, just a comment. 5'7.5" is find for the width. However, it also means I have to make sure that a 1x4 covering the upper outside of the fender leaves enough room to mount and remove my tires. I believe that is the case but will measure once I get my bearings and seals and get the hubs assembled and placed on the trailer. Then I will mock up the 1x4 on the edge of the fender and try removing/mounting the tire.

... 'er... well.
I’ve got basically 1.5” clearance now , but even with the wife and my friend in the trailer I can’t see any spring deflection... I may get a rub ... may not ...don’t know ... another “test” and something to improve later on ... That’s the Great thing around here , if you don’t know , then test it out , and if it works , tell everybody .... and if it it Doesn’t work , be Sure to tell everybody !!! 
on the new models instead of metal, and thinned up the base of the saw. 
