Standing back and looking at your day, how would it be any different if you had 500AH of AGMs instead of the Li batts? (over the year since every day is different for solar etc)
Not saying this is how it is, but wondering what your own analysis is on how your Li time would compare with the same time only with AGMs instead.
Whatever the benefits of Li are, do you see much of that really? Eg, you are going to full with shallow cycles which AGMs would like too, and your charging amps are not so high, being what AGMs could take too.
Say you had 500AH of AGMs and after four years doing your routines (AGMs not getting a true full charge often enough say), they now need replacing, but the Lis are still going strong.
The Lis cost say four times what the AGMs cost, so if the Li batts last sixteen years you just break even on money? If the Lis get too low at eight years, you paid twice as much as for AGMs? Eight years seems what those boat guys got?
Perhaps Lis would better suit somebody with less solar to take advantage of operating at lower SOCs or whatever? Perhaps there is a threshold for how much solar Lis would be no better than AGMs but just cost way more?
Just thinking there must be some way to figure out whether it is worth it to go Li depending on your RV set-up and lifestyle.