i don't feel any difference towing with or without water.
but, then, i'm no where near my tow max.
i specifically made sure i had a tow vehicle that could easily tow my trailer's GVWR. an extra 250lbs. of water doesn't make any difference.
we don't have the luxury of water hookups, where we camp, so carrying water is very important.
i think those that have iffy towing numbers, will have issues carrying water.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC