3" plug valve at each end
Ladder with cat walk
Roll-over protection dome well
Aluminum wheels and fenders
Same vent as the asphalt distributor (you don't have to open the dome lid to load and off-load).
The trade off on building an asphalt distributor is always payload (long truck) vs manuverability.
Build a shorter, more manuverable truck with a smaller tank, and with a trailer you can still haul 20+ tons to the party.