CAG brings up good points. I have had a 35 gallon bladder I got from Camping World years ago. It was made by a company in CA, though I don't recall the name. I think CW still carries them. Mine has lasted extremely well for a very long time. I have been impressed that it is very easy to dry after use and I have never had any mold inside it.
Just be sure to buy something that is confirmed for use with potable water.
When boondocking, I can almost fill my fresh water tank, when empty, with the bladder. I would have a hard time fitting a 100 gallon bladder in my truck bed with my fifth wheel hitch in place, and I wouldn't want to put much of the bladder on the tailgate. You also have to consider the "roll" effect while driving any distance. I built a wood platform with sides to keep mind under control for longer distances.
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2020 Eagle HT 30.5 CKTS Modern Farmhouse (16" wheels, spring shackles set on lower hole of frame, SumoSprings TSS-107-40, standard kingpin, B&W Companion slider, TST-507 TPMS, Progressive Industries hardwired 50A EMS HW-50C)
2019 F250 SRW SuperCab 4X4 SB 6.2 (10,000# GVW) 3.73 Axle 18" wheels
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