55 gal plastic barrel as a fresh H2o tank

Thanks in advance. I searched the threads in advanced search and was unable to find any reference to this, although that seems a little odd, cause i don't think its that far out of an idea.
So i am putting together a material list for my 8x16 ct. Currently its pretty much an empty shell, except insulation and a roof air. My son and I use it for the dirt bikes. Anyway, I am going to build a toy-hauler of sorts with a counter and sink in front, with cabinets, and a shower to the side, drop down bed in the back, yadda yadda yadda. My question is, is there any cons to using a 55 gal plastic barrel, on its side, for a fresh tank ? i can tap into the center top for a fill hose, vent it higher than the filler, and pump and drain off the center bottom, (the barrel would be on maybe 2" stilts at each end) other than some tongue weight, not really a problem as it is pulled with a duelly p/u. I figured that it can fit pretty nicely under an enclosed counter, with a rv sink to the side. Accessible though a cabinet door, to reach the drain for winter. Seems pretty maintenance free as these plastic barrels are pretty tough. We have them in abundance as our auto windshield washer solvent comes in them. I realize that the alcohol in the solvent isn't very good for you, as i would flush the barrel thoroughly before any use, and probably wouldn't be drinking the water, other than maybe boiling it for mac and cheese or spag, or something like that.
So i am putting together a material list for my 8x16 ct. Currently its pretty much an empty shell, except insulation and a roof air. My son and I use it for the dirt bikes. Anyway, I am going to build a toy-hauler of sorts with a counter and sink in front, with cabinets, and a shower to the side, drop down bed in the back, yadda yadda yadda. My question is, is there any cons to using a 55 gal plastic barrel, on its side, for a fresh tank ? i can tap into the center top for a fill hose, vent it higher than the filler, and pump and drain off the center bottom, (the barrel would be on maybe 2" stilts at each end) other than some tongue weight, not really a problem as it is pulled with a duelly p/u. I figured that it can fit pretty nicely under an enclosed counter, with a rv sink to the side. Accessible though a cabinet door, to reach the drain for winter. Seems pretty maintenance free as these plastic barrels are pretty tough. We have them in abundance as our auto windshield washer solvent comes in them. I realize that the alcohol in the solvent isn't very good for you, as i would flush the barrel thoroughly before any use, and probably wouldn't be drinking the water, other than maybe boiling it for mac and cheese or spag, or something like that.