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.
A converter is standard equipment on most RVs. Connected to a campground power pedistal or your RV generator is running the converter it changes 120 Volt AC power to 12 Volt DC and supplies power to the RV's 12v circuits and charges the RV batteries. An inverter does the inverse. Inverters take 12VDC from the batteries and change it to 120VAC.