Rope Climbing equipment is manufactured in the quality you are looking for, and you can be sure to get the durability needed. Additionally, you can ask them about the equipment you purchase there in the store in regards to your weight. As far as a beam in the house. A center beam that runs the length of the home is good, usually find these in the floor (ceiling of a basement). Just take into account weight distribution in the joists of the ceiling you are using. A mobile home ceiling will not hold, but a beam in cathedral ceiling of a house might.

Good luck, and be careful!