If your authorised representative in the EU put your products under his/her own name, then she/he takes over your responsibilities. In this case he/she must have sufficient information on the design and production of the product, as he/she will be assuming the legal responsibility when affixing the CE marking.
Many of the larger inverters come with a built in charger. Typically a 2000 Watt or larger inverter will have a 50 to 100 Amp 3 stage charger. These are much better than the typical RV converter/charger. If you are planning on a more powerful charger anyway, the combo units make sense.
When shopping for portable generators, the predominant outlets are the 5-20R and the L5-20R or L14-30R. You will find some with RV receptacles and numerous with a DC receptacle for 12volt charging. Remember to match the receptacle on your generator with the plug of the extension cord.