Palomino Maverick holding tank upgrade

Where are you going to put the bigger tanks without gutting the entire camper and starting over? Everything's shoehorned in to begin with. There's no room for a bigger anything anywhere as a general rule.

In all seriousness...I have done a temporary tank size increase (our previous TC) by placing a blue boy on a hitch rack in the rear receiver. I modified the blue boy by cutting a hole in the bottom and installing a valve so I could dump it right from the hitch rack (no lifting!).This allowed us to drain the on-board tanks into the top of blue boy and drain from the bottom. When we got to a dump site I just dumped the on-board tanks and blue boy at the same time.
This effectively doubled the size of the tanks in the old TC...

Good luck, Bill

I though about doing that on my previous TC which was a Maverick 8800. I believe the original black and grey were 7 and 8 gallons. The only way I saw was to add and external tank for the sink drain only. I've seen some mounted under the wing just inside the bed rail on lances. There was almost no extra space for larger tanks under the shower floor. Not sure how much the 1000 has.

We ended up buying a TC with a basement.

Here's one suggestion;