To cover the foam filler, I cut some of the darco fabric to size, taped it to the frame so it hung vertically. Following the directions on the can, I sprayed both surfaces, let it dry to slightly tacky, then pressed it into place. I added a couple more pieces over places I felt it needed, even over the brace you'll see in the pictures below. I wrapped a little into the wheel well because I didn't have enough surface area on one edge to stick the fabric to. I'll keep an eye on it to see if it holds.
Let this be a lesson to us all about the dangers of "China Bombs"! I should have checked the dates on the tires the day I bought the trailer and had them replaced. They were 2010s! If I would have done that simple step, I could have avoided a tire change on the side of the freeway south of Mona Utah. Luckily it was the curb-side tire so I was somewhat protected from traffic. The trailer would sway every time a big rig would pass. Not fun.
Lessons learned:
1. Check age of tires if you don't know
2. Have a tire changing ramp onboard so I don't have to use a bottle jack (my rig is tandem axle)
3. Have safety reflectors to deploy and take time to deploy them ( I now have a set for each vehicle and one in the trailer)
4. A set of ear plugs for my wife so she can't hear me "blessing" the trailer, tire and every rig that blasted pass us on the freeway...
Here is our "China Bomb"