Air Loss
Heritagerider sounds like you have a leak in your brake valve. they will go bad if condensation or rusty air grunge gets in the valve. have pumped the brake fast and sometimes this will stop the hissing but it is only a short fix . you will have to take your MH to a shop to R&R the foot valve. what chassis do you have? If its a Freightliner or Spartan they can help you right away or most truck shops as the units are mostly standard. if you are handy you could get the part at a truck parts store and do it yourself. hope this gives you some options.
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