36 Volt & 24Volt Diagram

I am planning on running a MinnKota 36 volt trolling motor and 2 banks of 4 50 watt LED lights. I am going to be using 3 Duracell group 31 AGM batteries. I do have a electrician friend that will help me with this and I believe that I have describe this accurately to him and he seem to have no concern with my plans. I do wonder if the middle battery will have to much of a load on it. Any concerns of constructive criticism would be appreciated just in case its a "hay you will surley catch on fire if you do that" type of criticism pleas let me know. Thank you