Womo to 3,5 To

Hello together, I have a Womo with 2,8 To empty mass – and now the question, I have to have such things as a steering card, must now also have TüV every year. The problem certainly already knows, is there there for WoMo,s with a total mass of 3,5 To an exception regulation ? I have the driving license B but this should probably not be like with the B to 7,5 To, or am I there on the wrong steamer ? I look even further in the net – but maybe one already has experience So thank you in advance.