Still saving the funds up to purchase the Multiplus II. Hard to be patient at times.
Excellent recommendation earlier is to keep things simple. I am currently planning on constructing a simple lightweight wood frame that can be quickly attached to the frame of the dolly. It will support the bus bars (which will hold the battery fuse) and allow possible charge controller input in the future), UL rated outlets, shunt, small load center and the Multiplus II. Prior to attaching it I will give it a coat of intumescent paint which I have from a previous project.
Envisioning placing the Multiplus II higher on the frame. This will create a counterbalance for the battery pack and will allow leverage to work in my favor.