we use a Pressure Pro system with which we have been very pleased .... it is an American made system and is backed by very good customer service .... the best time to buy a system is before a tire going bad has done major damage to your camper .... I was a bit hard headed, it took 3 tire failures to finally convince me to spend the money for a tire monitoring system .... after traveling with one, I wouldn't want to go back to not having one .... I like having the sensors screwed onto the valve stem, they are much easier to remove/repair/replace
Jim