You can get a parallel cable for EU3000's that gives a 50A socket (e.g. amazon
). Obviously its still not going to have the same capacity as a real 50A connection but as long as you don't try to use everything at once there's no reason it shouldn't work.
I think the kit would have to combine both generators and then parallel the RV AC busses on that. As long as both busses don't try to pull more than 50A combined (which they could easily do on a real 50A connection) it should work without tripping the generators offline.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam