In the US, you can get Concrobium which is non toxic and will prevent mould for a while. It is allegedly just sodium carbonate (pool PH+). You can also mix up your own. Homemade Mildew Preventers That Really Work - Practical Sailor
I have a trailer keel roller mounted on a wooden post at the stern (which also serves as mast crutch while on the road). The sides of the roller keep the mast centered while I lift the forward end.
Most of the run of the mill 100Ah batteries we see in the US have a BMS capacity of 100A, but 200A is pretty common too. Smaller batteries seem to be about 1C: you'll see 50A max on 50ah battery, 10A on 10ah. You can also get starting batteries capable of up to 1000A for brief periods, but...
A) Victron controllers limit the current they put out regardless of power available, e.g. you could get a 10A controller with a billion watt panel, and it would still only put out 10 amps. Victron controllers are rated by the current they will put out and the input voltage they can handle. I...
if you replace your halyards with thin messengers, it is easier to untangle them and then pull the halyards back in. It's hard with the mast up though.