Why does doblo shake when accelarating?

Why does doblo shake when accelarating?
It sounds like one of your tires are out of balance. To check it out put your spare on the right side and drive If it satisfies the problem, get the original tire balanced. If it still does it with the spare on, put the spare on the other side and check it out the same way. If that is unsatisfactory go to plan B.

Check the motor mounts. Also, check the transmission mounts. If they are good, then check out the tie rod ends for loose play.

Also see if it has a torsion dampener strut. It works like the screen door closer on your house. If there is one on yours, it may have lost its prime oil and not dampen any vibration. If so, replace it.

A more remote possibility is that the bolts on the torque converter have loosened and this causes a dynamic condition which causes a vibration. Check then for tightness. Retighten if loose. Lastly, if yours is an older vehicle, it may be that the rubber on the body mounts have gotten old and hardened and that too can give off a vibration on a start off hard pull. And lastly, but not least, check that the exhaust pipes hanger-rubber mounts are good and that the pipes themselves are not in contact with the frame. Tension on exhaust pipes can cause vibrations too.