1986 skyline... insulation advice

[mark]

Hello I purchased a 1986 skyline fortune moblie home,,,, when moving it it lost most of the underbelly insulation and underbelly cover.. the question is what would be best to put in its place.....I was told i could insulate the underpinning with reflextive insulation...... would this be a good idea or should i just go with fiberglass insulation back in the floor..... thanks Mark