Scotty,
Are you considering a PTO driven set up???
If so let me know and I will contact my hydraulics vendor for price and part numbers to rig one up.
No attempt here to sell you one, will simply arm you with part numbers, etc. to go shopping in your part of the world.
I have owned a few trucks with wet lines and also sell quite a few here for new truck installs and they are fairly simple.
I don't see why you cant do it.
Is the dump trailer a one-line or two line set up??
You may need a little extra plumbing if the dump trailer is a one-line system and your farm implements are two-line.
I will caution you that whatever route you take there has to be a valve between the hose inlet and outlet connections on your truck for safety. If someone turns the PTO on without anything connected it will split the pump if there is no valve to let the pressure back into the return side.
Been there, have the t-shirt.
Let me know if you want me to dig into it for you.