Traccar Fleet Solution

Hi, is there any what has worked on a Fleetsolution with Traccar ? I am looking for a Fleetsolution to sell and a Guy what can after this extend it to my need ! Let me know with link, what offer (solution you have) and if you can extend it for me. I need it for Water - means i need to have a different Map OpenSeaMap But need also modified mobile Solution. Tnbaks for reading this - let me know, what you can do for me (show me please a Solution for Traccar you have allready done (Demo)