Thank you all for the input. One other frame I used RC2 for the whole thing. 9-6-9 main tubes, standard diameter. Used for commuting with loads never exceeding 20 lbs. It has done fine, however I know adding 40 or 50 more lbs to the bike will dramatically change how it deals with the weight. Looks like I need to order up some more tubes.
Seems I am getting spare tubes laying around here. Not sure how it happened, but I have some RC2 seat stays and head tube. Add to that some main tubes. Sure will find use for them some day.