I don't have Max 2 but it shouldn't be a problem to use any ebook reader app or file manager on iPad with wifi transfer capability, to transfer ebooks to Max 2 wirelesly, by typing the given iPad's network address (after clicking on the wireless transfer icon in the particular app) into the web browser on the Max 2, that will result in an opened transfer interface.
I use this method for wireless transfer from iPad to Kobo Aura One or from PC to iPad, using either wifi network on my router that I use for internet access, or wifi network of my HDD enclosure.
When I want to transfer 10-20 ebooks at once from PC to iPad I store all the files in a rar-ed file uncompressed, and extract it on the iPad thereafter.
I use free iOS apps like Foxit pdf reader, PerfectReader, CHM+ etc.
https://www.youtube.com/watch?v=Ss8b2kRj5LM