Does anybody know of a company that will refill water on a Toy Hauler while at Glamis. I am going for 5 days and will have several people and concerned about running out of water and do not want to have to pull the hauler to get more water.

At Glamis there are a few roving services that will fill you and drain your gray/black. I have had them drain my waste tanks. It was about $30... Well worth it if you compare to driving out somewhere.

What we do for the long trips is get a plastic 55 or 35 gallon barrel. they are like 10 to 20 for a food safe grade. I put it in the shower and when we get low toss it in the back of the truck and go fill it up. When I get back I just sphion it into the trailer.
Camping word also sells bladders for water. little more cost but some guys tie them down on top there trailers and fill them up at the last stop, and when they need water just hook up the hose and let it drain out from the roof.
I've seen some at buttercup and gordons but only on holiday weekends.