Naio wrote:
Your battery 'pen' looks great.  I do have one concern.  It looks like you have screwed the crosspieces into the cut edge of the plywood.  That part of plywood will not hold screws -- they will come out.  With the weight of the battery and the movement of the toyhauler, they will come out SOON after you get on the road.  I can help you redesign it, if you need.
Thanks for the advice.  I will keep an eye on it.  It is screwed and glued.  I put the screws in at a slight angle so they go through several layers of the plywood.  Maybe I'll run some metal plumbing strap over the vertical pieces