To win an anti-dumbing law suit it has to be proven that the domestic market(s) have been harmed and the prodcuts are being sold at below the prices that they are sold in the manufactuers domestic market, at least in the US) and anti-dumping penalities. In the mdi 80's hyster filed suit agains, Japanese ift truck manufactures teh final decision was not to assess a penalty but an agreement to limit the number of units imported by each manufacturer. Later, Hyster filed in the US & each company was assessed an anti-dumping penalty from ~10% to ~53%. This started the assembly operations of Japanese lfit trucks in the US and later more agdressive manufacturing by some. Look what Toyota has done, in the US, since then and Hyster is certainly not the same as they were in the mid 80%.

Generally you are right.
The pallet trucks will be more expensive. About 20% I presume.
And the money from the extra duties will go to governments. As all customs duties and taxes.
The endusers will pay the price.

The question is: if the price is too high for preserving the domestic, european industry?

I am sure that European manufacturers are able to fullfil the market expectations. Now they are "strangled" by the import of cheap chinese trucks (and european taxes + other costs).
The production volume, when it raises, will cause the costs reduction. And probably the prices.

In Poland we have at least 3 manufacturers, who make pretty decent pallet trucks. The market prices (for the standard stuff) are on the level of 250-300 Euro net.
Chineese trucks are sold for 170-230 Euro net.
It means, that if the domestic manufacturers raise the production volume 20 to 30% this should result in costs/prices reduction and the difference will decrease.
The competiton from domestic and other manufacturers will keep the market prices under control.

Generally - IMHO this extra duty (if it happens) is not a tragedy.
It makes sense.