Nuttin wrong with using your back. The issue is most of use do so in an improper manner leading to future injury. Few people know the correct way to lift and of those that do fewer yet put it into practice. I try to but i still often lift wrong in a hurry or because the object is light.YUP! I made that about 30 years ago. I hurt my back in the mid 80's trying to lift logs to hand split so when I decided to make this one, I thought why not use the hydraulics to work more. It may not be perfect but I've lifted 45" diameter pieces to split. The lift and tongs holds them while I put them thru the wedge. Its been awesome. I made the boom long enough that I can load pieces on/off to the back of my truck.
I put a similar hydraulic lift (a engine hoist setup) on the front of my 6' X 12' utility trailer to load 10' -12' logs. The tractors forks have been extremely helpful in unloading. I've found I can pick them up from the end, if they're not to heavy, and unload the complete trailer. Thankyou LORD - I don't have to use my back like I used to when I was younger.👍
You certainly have a nice setup would be fun to play with.