yep
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yep
When just dealing with a couple of batteries taking the load off one side of the bank is fine. When you start working with dozens of batteries in series/parallel banks the load should be wired across the bank, opposite the charging circuit...also wired up across the bank. Has to do with capacitance and voltage drop across the wiring, etc. I take care of automation and electrical systems on multiple offshore, oilfield facilities and am very familiar with that kind of thing. Short answer...its fine. :)
If you are going to install an onboard charger to charge the batteries in parallel, go with a dual output and hook each output to each battery. This is what Dual Pro recommends and what I have done on several occasions.