The 30RLI travel trailer isn't listed on the Keystone website, there is a 32RLI. In any case, the Cougar Half Ton models aren't equipped with provisions for a washer/dryer, so any work you did would be a "one of a kind modification". Where are you planning to install a washer/dryer? The front closet is over the passthrough storage, so there may not be enough "structure" to support the load and other locations may interfere with slide operation/weight and balance, so any further information about your plans would help clarify any potential suggestions.
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS