Thanks everyone for your kind comments.
Danny: Thanks for contributing the handle - it found a good home.
Larry: The tongue is bolted thru the floor with 2x3in. steel plate washers on the inside to help spread the load. The tongue is not connected to the axle. The 3/4in marine plywood floor is so stiff and strong I didn't think it was necessary and I figured I could always connect them later with some angle steel if needed.
The axle is bolted through the floor
and a 2x2 cleat that also connects the floor to the wall, which also spreads out the axle load.
At the beginning of each season I check the nuts on both the tongue and axle for tightness. The first time I could tighten them down a little although they weren't loose. Not so after that.
I've had zero issues and would not hesitate to build this way again for a lightweight tear, but only if I were using marine ply again. As you can see from the picture of the underneath spare tire, after two years use and just back from a 9800 mile trip the bottom is still looking great and doesn't require any attention.
Becky: my camera is a 12.1 megapixel Canon PowerShot digital Elph 100HS. Takes great pictures and is quite small to carry around. I rarely use it on auto preferring to set the white balance myself to (usually) sunny or shade. I mostly only use the flash for fill in outdoors if the sun is behind the subject, preferring to use available light whenever possible. I have an underwater housing for it and take it on scuba diving trips as well. And it shoots great HD video. I think it was less than $200 on Amazon.
Canon makes a bunch of different models in this form factor, some better than others. You need to do your homework to find which ones are better. Check out reviews at sites like
http://www.imaging-resource.com/,
http://www.steves-digicams.com/, and
http://www.dpreview.com/Hope this helps!