Hey guys. There are a lot of theads with dual battery set ups which are great and I got a lot of great info on many of them. I am currently in the process of doing a dual battery set up for some camping accesories I need. So I am getting set up with another auxiliary battery. I will probably run the NL system but was wondering what everyone recommends for a deep cycle second battery? I would love an optima but can't spend that kind of money now. Also do I necessarily need to run the same brand and same type of battery for the start and the second? Final question is battery tray. Is the stainless tray with the relocation of the coolant overflow worth the money? Thanks for all the help.