6 Gal Hot water tank

Thanks for all the interesting comments. I have done this before on my previous trailer that had a bad gas valve. i removed the upper anode and installed a 3/4 inch close nipple then a 1 inch to 3/4 inch bell reducer. I took a std household element and squeezed it gently and got it to fit through the 3/4 inch nipple and into the tank. The household element is shorter than the anode rod so it fit with plenty room inside. I wired it through a household thermostat attached to the bare tank skin. I ran a plug to shore power or my outside receptacle. This worked perfectly. Also the element is only on for mere minutes as it heats up the tank super quick. Sooo no power drain to speak of. Only short duration. The new trailer I now have has a hot water tank door that is closer and all the fittings will not allow me to close the door unless I cut a hole in it. Dont want to do that... But yes it worked for years and was great.. That is why I want to do it again but this newer trailer has different dimensions.