I decided to go with solid metal valve stems, instead of using extensions, as referenced by CaptDan and Taylorgso.
Spoke to Bill Falkenborg of yourtireshopsupply.com Phone is 800-300-2674. He was very knowledgeable and stands behind his product 100%.
The one that fits my Solera (2011 on 2011 Freightliner) is:
DL1SPFR Chrome Duallyvalve Kit with Front Stems
He also said that he would welcome the opportunity to send samples to Forest River for evaluation. Bclemens, are you listening? Give him a call.