I use a 60 gallon water bladder. Ive carried it on my utility trailer which I double tow behind our FW. Ive also put it in the truck bed behind the hitch and even used it in the back seat of the truck once. It wasn't full in the back seat but it worked. They are very durable and conform to irregular areas. I use an adapter and rv water hose to pull it through the winterizing valve so there is no need for an separate pump. Ive plumbed in extra filters and an expansion tank along with a bypass valve so the pump can suck through the winterizing valve and dump into the fresh tank or just pull from the bladder.
