Thanks for the input, well you gave me something to think about and read upon! about the LiFi batteries and what I found out wasn't much other then rc's and smart phone tech. Didn't come across (limited research time)much on the larger storage banks.
The OSB I used on the rear wall was rems. from the sub floor but under metal siding with barrier it'll work great.
project took side chair to late summer playing.
I believe I'll be ok with weight but, just because I have a set of AirLift bags on the shelf I plan on installing before hitting the road next summer.