I was in the same situation a couple of years ago.... You spend all the time splitting with an axe then stacking then moving..... I then progressed to a 14t petrol splitter and then last year realised it still takes forever.
I can't buy straight lengths in as it leaves min profit and most of the wood I come by is ARB waste so I decided to build my own processor.
I got a large single axle trailer, an old twin cylinder Lister diesel engine, a 30 inch tct blade,and a couple of rams and a pump..... Lots of head scratching lots of welder burns but now my processer lives and cuts me a couple of hundred tonnes a year....
All in it has cost me about 1k to build and it's how I wanted it and in the way I do things.... It won't win any beauty contest but it works and is safe and cuts all the logs I need.
Since having the processor done it works out that what I used to cut and split in a month can be done in just over a week....
