With what you have here try this as an all around:
984 pt:
12 boyz,nob,
pk,
bp,trukk (rokkit launcha),ram 147x2 294
11 boyz,nob,
pk, trukk (rokkit launcha),ram 136
Warboss, lucky stikk, 'eavy armor,
pk,
bp,shoota (with 3rd trukk squad) 119
10 tankbustas (rocket assault guys/?),trukk,ram 165
5 lootas (heavy machine guys/missile guys can count as lootas with ease) 70x2=140
5 bikers,nob,
pk,
bp 130
16 points to play with, you can increase/decrease tankbustas and lootas as you see fit. With 16 pts you could do red paint on trukks, boarding plank on warboss trukk, attack squig on warboss, rokkit launchas/big shootas in boyz squads, bomb squigs on tankbustas, nob with big choppa for tankbustas,etc.
If you don't like tankbustas you can take another trukk of boyz and bring more bikers. In low points tankbustas can crack what lootas may struggle with, they also help vs monstrous creatures and sv3+ if you can get them to some decent cover to camp.
1481 pt:
CAD1:
11 boyz,nob,
pk, trukk (rokkit launcha),ram 136x2=272
12 boyz,nob,
pk,
bp,trukk (rokkit launcha),ram 147
Warboss, lucky stikk, 'eavy armor,
pk,
bp,shoota (with a trukk squad) 119
10 tankbustas (rocket assault guys/?),trukk,ram 165
5 lootas (heavy machine guys/missile guys can count as lootas with ease) 70x2=140
8 bikers,nob,
pk,
bp 184
3 deffkoptas (run as single units for maelstrom games, twin linked rokkits is the best option usually) 90
CAD2:
Warboss, 'eavy armor,
pk,
bp,shoota (with trukk squad) 94
15 shootas,nob,
pk,
bp 145
10 gretchin, runtherd 35
3 deffkoptas (same as above or split all up into 3 squads of 2 if you don't mind them running when 1 dies) 90
19 pts extra here, these lists are just base ideas based on your currently listed models. You could also drop the 2nd
CAD and put a weirdboy level 2 into a 30 man slugga boy squad and hope for da jump
Maybe get 2 more trukks or a battlewagon for this range or higher if you plan on doing a convoy list. Warboss in a wagon with meganobz or boyz will have a higher chance of getting to your opponent's side of the board. Biker warbosses are amazing for delivering pain too. Burna boyz work best in battlewagons or as mechanics for gun wagons/walkers. If you are restricted to 1
CAD you can take 3 killa kans in your main
CAD with grotzookas or rokkit launchas. Skorchas are a waste of their ballistic skill.
At 2000 points you might be at a disadvantage with only 4 trukks. I personally only run 4 trukks in my 1850 but they have a unit of 8 tankbustas in each and the rest of my army is made up of deffkoptas, lootas and warbikers with my warlord as Zhadsnark da Rippa from the Dred Mob book by Forgeworld. I also have a painboy on a bike. With the new formations in the Waaagh! Ghazghkull updated supplement you might be able to make use of the Great Waaagh!-Band detachments. Most of your army fits in well with it, and it grants some neat benefits.
Edit: Forgot to specify Rokkit launchas on trukks, now fixed.