I disagree, Tukker lists are still awesome, fun, and very capable of winning games, but with 6th edition trukker lists are even harder to play right, It is so easy to charge a squad of boyz into a suicide mission.
Powerclaws in trukk lists are essential since trukkers will be mostly charge a single target with two trukks most of the time. Also 4 trukks is a good number to be at, especially if you compliment them with other units (meganobs in a BW, Shoota Waggons, Nobs in a Wagon, Nob Bikers, etc)
The issue I have with this list is the fast attack choices
Deffkoptas work terrible in large squads, since they flee the first time they get shot at, and Kustom Megablasters are so unreliable that they are not worthed
I would recomend to you making 2-3 1man squads of Deffkoptas with
TL Rokkits, use them to run around the enemy army and poke down vehicles or squads (instakilling
SM is always awesome)
also a Big Mek Kustom Forcefield is a must
imo in any trukk/BW army
and the last thing i can think off is drop one of the meganobs squads to get 20 shootas in one of the wagons (also allowing you to go full sluggas in the trukks since that battlewagon will dakka as it runs around hitting stuff), and put the warboss with the meganobs (either taking Mega Armor or just cloth and claw on him) since if he is solo riding his bike he will probably get himself killed really fast
ou yes, and i'd probably drop the zapgun on the battlewagons. zappguns and kustom megablastas are just so unreliable when orks are shooting them. I'd probably just put a couple of rokkits or even better just baisic big shootas on the battlewagons (if anything at all past the deffrola, since thats the only important upgrade)
Also I would look into adding some lootas to any list. They are the most competitive unit orks have
atm. They just provide such great supporting fire, allowing your boys to handle troubling units by waddling them down, and dealing with lightly armored units from a far
In any case keep the trukker waaagh rolling

Hope my comment helps you get some ideas