I'm not sure I understand your post... Are you suggesting this as a product improvement, or asking if the brakes and hubs can be changed out on your Solitude 369RL (#334)? If it is the latter, the brakes and hubs are covered by Lippert, and therefore any modifications or additions to their axles should be discussed with them directly regarding any possible impact on warranty coverage. Their Customer Service team can be reached at (574) 537-8900.
Otherwise, I will be glad to forward your product suggestion to Marc Hauser, the GM for our Solitude/Momentum product lines.