Filling up at home is not about weight, money or MPG's although these are all factors to consider.
Filling at home is all about convenience. Finding the water fill is step 1. usually finding the fill is easy but not always. Connecting to the fill is step 2
hopefully there is a standard hose connection. but not always you may need a water thief or some other gadget. Getting your RV positioned close to the water fill without blocking the road. I have a 40 RV 5'er getting close to fill can be a challenge. I also have a 85 gallon fresh tank that takes 20-25 minutes to fill. Waiting to fill can also be a headache. What if someone with a 85 gallon tank is in line ahead of me! Quality of the water source you are filling from? Is the source chlorinated water is it untreated well water?
You can eliminate all the steps and variables, by simply filling at home or from a known source. It simply a more convenient approach with no variables or delays
If you camping style requires you to use your fresh tank regularly. You need to factor water hauling ability into your RV buying decision. If you need to haul water by an RV capable of hauling water.
Often we try to make the discussion/decision about money when often the decision is about doing your homework and buying based on research not impulse.
RV's that are capable of hauling water (most are capable) are no more expensive than the models that perform poorly when carrying water. It's all a matter of knowing your wants and needs before buying vs. figuring it out after buying.
