Hello there ! Like the previous poster, I'd say you may have too much vehicles in your army at this point range.
For the infantry I'd keep the Arquebii unit too, they're good and can even destroy light armoured vehicles. AP3 and Sniper means they'll wound these Marines on 4+ without any armour save which is nice to pick up that Missile Launcher or Flamer Marine. Make a Vanguard unit out of the other, I recommend making its alpha your Warlord as well so you can use one Plasma Caliver in relative security (Doctrinal Imperatives still gives you two turns of rerolls thought), more may be overkill as it's already 30 pts for the gun. But an Arc Rifle may be welcome as well, your unit will be very flexible. Give him a refractor field to have a 5++ save that will save him, he's still potentially able to get ID with that T3.
If you drop a Dragoon that'll give you some spare points to perfect your infantry. I'd leave the Dragoons with their lances, I personally never had much luck with the Radium Jezzail. Giving them Phosphor Serpentas may be a good idea if you have the points.
As for the Dunecrawler, If you keep them in the same unit I'd use the same weapons on both, and I recommend the Neutron Lasers. For 25 pts per model you have a 48" S10 AP1 blast weapon, that comes included with a Heavy Stubber as well. With two of these there's a chance that unit you just shot at may not exist anymore. Bonus points if you blow up an enemy vehicle in one shot and kill the guys around it. If you run them as two groups then keep a Neutron Laser but maybe equip the other with its base weapon, large blasts are still nice to mop up mobs or these Necron Scararabs he'll send at your Dunecrawlers to prevent them from shooting his guys.
I don't know how much spare points that would give you, but in any case my advice is to buy refractor fields to all your sergeants, it's just 5 points and may be the only thing standing between life and death for them. Love your soldiers and they will love you back with good rolls.
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