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As a bit more to locate things, look at the brake pedal as a start, then the linkage from it goes through the firewall to the brake master cylinder. From there, there will be lines running to each wheel.
I have not looked at that specific model but there should be some common ideas involved. Newer vehicles should have a seperated set of brake lines and sections in the master cylinder.
If they did, in fact, lose total braking other than parking brake, it sounds like there is a major problem right at the master cylinder, so I might expect trouble there. Possibly all fluid gone?
There is also a second thought which may come into play if the rv has been idle for an extended time.
If the RV has not been taken care of and used, the brake fluid can draw moisture and when settting that water in the fluid can cause rust to form on the wheel cylinders.
The idea is that the master cylind pushes fluid to each wheeel where there is a cylinder which then converts that fluid pressure back into mechanical pressure to move the brake parts.
If there is water in the whole system, it can cause the parts, even at all of the wheels to form rust.
Then when we start to use the RV again, that rust can score the inside of the cylinders to make them leak fluid. One way to upset the two portions of the safety idea is if ALL the wheel cylinders begin to leak at once!
Thing to look for is a very easy to spot of wet fluid at the leaking wheels! That can also explain the smell as it often gets on the hot exhaust parts. Can be quite dangerous as the fluid can burn!
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one! 
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