Water.......
Everyone is kinda afraid of carrying water.
Yes it does add weight but has minimal affect on MPG.....wind drag is biggie for that
Water....
We use to only carry 1/3 fresh water tank
Use to. Then one CG had main water line break. Took a week to fix then couple days flushing before it passed testing for use.
Last time we ever got caught without FULL fresh water tank
We also changed HOW we used water.
CG water source was for filling/re-filling fresh water tank even when at FHU sites.
$6000 in damages/costs due to flood while hooked up to city water.
After that on-board pump only.
Water....
As for weight.
Know EXACTLY how much truck/trailer weights and how much our stuff weighs.
Go across CAT Scales once a year.
$10/12 cheap price for REAL information