Hi firefighter-1177, nice paint
As for your delimiter why not have the best of both with a removable tipper as 1:1 have and then you can hook a trailer when the tipper isn't required by making a sub frame that has a king pin in it with tabs ether side and then you will need something compact to lift it without using a standard screw drive so ether a hydraulic mast mounted behind the cab or one of Tyler's
http://rctruckandconstruction.com/showthread.php?t=1846 actuators with some pivots ether side and hide the electrics in a dummy hydraulic tank on the side of the frame and some removable air/electric hoses for a trailer.....
Then you can have the best of both worlds when the work is getting slow
Cheers Tracy