Replying to Tablet as a laptop replacement for photography?

Hello NS , I will soon make a little change in the way i live, I will move out west once again but this time for good ( I will also travel other places most of my time).
not to forget I will pretty much live only with a 65 litters backpack
As the main thing I do in life is photography I need something to play with my picture a little bit ( I usually do B&W conversion and tweak some stuff but my editing is very soft).

I am looking for something to edit the said picture, the question is; can I use a tablet as my main ( and only ) photography editing/classifying tool ?
couple of questions come to my mind when I had this Idea
Is there tablet that read SD card ?
Can I combined a tablet with an external hard drive for saving my good photo's/video's ?
Wich kind of tablet would have enough resolution for me to edit photo's ( if this actually exist )?

Any other tips/opinions on having a tablet as a laptop replacement ?

bad english, my bad second language for me