Need help with water heater type

Hey guys. I am new to RVing and just bought our first travel trailer. We love everything about having it. But noticed after our first trip out that it seems the water heater is leaking. I also cannot get the drain plug off as it is rusted shut. So I have decided to just buy a new water heater but I can't seem to figure out exactly what model I have. I have figured out that it is a suburban 6 gallon water heater but cannot figure out whether or not I have the direct spark model or the model with the reignition option. I also believe the one I have now can be switched between gas and electric but again I am not positive. What would be the way I go about finding out which model to purchase. I cannot seem to find a model number on the sticker. I really appreciate any help as it seems it has already caused a little floor damage