Here is my post that supercub is following up. This is a OEM direct replacement, not an aftermarket add on. Believe me, the relay used by Monaco is going to burn out whether you use the MT960DC or some after market system.
Monaco built some very weird electrical systems, I know, I have one. On ours, the engine did NOT charge the house batteries and the shore power did NOT charge the engine batteries. I had to replace their 1 way charge controller with a 2 way system from
Megatech of Oregon to cure both problems. Also, Monaco used the cheapest parts they could buy and the battery boost relay was one of those, with cheap copper clad points in a high amp relay. It will burn out very easy and leave you without any boost feature. You can buy the silver alloy points model for your coach at
Murcal, which is designed for high amp constant service. Most parts used in the coach are much better quality, but for some reason, they cheaped out in the electrical department.