I'm with Eddie Walker. I never figured out why everyone wants to drag firewood logs back to some central spot to cut them up. Fell em, block em where they fall, split em, and then put them in the trailer to have stacked. Otherwise you are cutting, dragging through mud, loading and then unloading - all before you start to cut them up. The less times you handle it the better - IMO.
If I had a firewood processor - maybe then I'd haul them out to it - but even then I'd locate it as close to the felling spot as I could. And for lumber - you need to deal with logs - but again - locate the mill as close as possible to where the tree stood.
I know - to each their own - but I don't get it.
As for trailer design - my preference for any bush trailer is the walking beam. The wagon style just is not as maneuverable through the narrow trails and if your bush is anything like mine - I have to back in or out a lot which is difficult enough with a wagon on an open field - never mind a twisty trail.
I designed a flip down axle stand for mine. When I go to park, I lift the 3pt up a bit - flip down the stand, and lower the trailer onto it. Uncouple the ball and drive away. Come back - raise the ball into the coupler and connect - then raise a bit more to flip the stand out of the way. Makes life a bit easier.