LizBeth; I would suggest using a Marine style gas can or a metal gas can. Either of these will be better suited and can handle the rigors of traveling all the time.
I have a Honda EU2000 and it is connected to a 3 gallon marine above deck gas can by Tempo. This design allows the external tank to feed the generator
by vacuum as it runs. This gives me extended run time without having to refill the tank every day. I bought an extra fuel cap which allows me to use the generator
without the external tank as well.
The Marine tank is thicker material and the vent in the fuel cap is design to prevent fuel from coming out when the tank is rocking back and forth such as in a small boat or vehicle/trailer moving. With my vent open, I can almost turn my tank completely on its side before fuel will leak out. When the vent is closed, the thicker material of the tank can better handle fuel expansion like a metal one.
The Marine above deck style tanks are designed to connect to an outboard motor by quick connect fittings like I have setup for my generator
. I don't know if they make a marine tank for pouring fuel from one tank to another without modifying it.
Hope that helps!