We have a fifth wheel w/res fridge--have done a lot of dry camping. With factory inverter and 2 cheap batts, was able to drive between CGs before needing to recharge batts.
Simple stuff--if you take out more amps than you put in, the batts are coming down in charge. More/larger batts help, but still like a bank account--Went to solar, if have sun, unlimited time away from gen use; rainy/cloudy, more gen use.
First improvement is more and better/larger batteries, and the fridge will work well between hookups. For boondocking, you WILL need some source of recharge almost daily--solar or gen use.
Keep in mind, small solar setup not too expensive, but larger panel arrays and bigger inverters/wiring gets up in $$ in a hurry if you have it done by a professional. AMSolar did ours.
As to the water line for the icemaker--all I do is disconnect at the supply valve and let water drain out as it is all uphill from the valve. Not sure if that works for all fridges.
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'16 40QBH Phaeton
'21 Sahara HA toad
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten
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