Be sure to take note of the electric junction box just inside that access door, and figure out how to protect the connections/cables when you thunder that alternator out of there.
Ramming one of those connectors will make you a lot more electrical work...
A collection of lumber to make a ramp is how I did it. coming out is downhill, not so bad, a controlled descent...
An auto trolly jack came in handy for some of the install lifting, again, lumber bits to get the elevations required. Used it to get my barely balanced lumber ramp up higher so I could push it up the hill. Everything is about avoiding lifting it, get it propped, rolled, hoisted, pushed, MacGyver'd yup into there. A straight lift is for young guys with women watching...
It is ok to take a rest, get it in there somewhere and leave it. Come back later, or tomorrow, or 2 days from now... whatever recovery time is required.
Males have a real hard problem taking a break in the middle of a job. If your grip and fore arms are done for the day, you are going to break something, or yourself.
Whether it is worth it, depends on your charging strategies, and how you use the coach. Some busnuts, the engine alternator does the majority of house bank charging as they change locations frequently, and avoid the power pole. Other busnuts use other methods to do most of their charging, generator, solar, plugged in somewhere.
Your design, your camping style, your choice.
My preference in a build is to keep the stock coach heating, so the big alternator is half way justified already. Replacing the stock regulator with a 3/4 stage one does a slick job of charging the house bank properly.
Good luck with the decision, hard to do looking forward, easier to do looking back.
happy coaching!
buswarrior