No need to feel so sad, John!
Our 30A Victrons do the job, IMO, for their intended use. On our typical move between locations we target 4 to 5hrs (MAX) road time -- leaving in the mid-morning with, say, a 70% SOC, by the time we're stopped for the day, we're right at 100% in our 300A-Hr Battleborns. The 4/0 cables you and I used for our applications handle the current perfectly.
Still thinking we've both got the right 12/12 charger solution for our style of RV'ing (but, there is a bit of "Amp - envy" going on over here!). Now, that said, if our rigs had the larger lithium AHr storage like @jd1923 JD has, the 50A charger would be warranted, concur?