I have an Atwood, the only problem I see in replacing the element is access, I am the opposite of petite and it's in a small compartment and covered with insulation.
Other than that, simple out and in job
One of my "People" (if you folks think I know all this stuff, guess again) is Fred Brandberry of www.rv101byfred.com as I recall, suggests using a 240 volt element, this means you get a fraction of the power (1/4) takes much longer to heat the water (in fact I'd only heat it with gas and use electric for keep warm) but if you are on limited power... Does not trip the breaker as fast.
What I would like to see (Atwood are you reading) is a dual element water heater, It would have a 3-or-4 position switch
Low (med) high and auto.
On low it would use only the 240 volt element (1200 watt thus becomes 400 watt) for keep warm,, HIGH it goes all out, (1400) if you added the medium then HIGH would use both for 1800 watts, AUTO would require a upgraded controller so that it would use the LOW for keep warm (Say 1 degree below set temp) and switch to HIGH when it is currently set to activate.
But I like the manual option better.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times