Axis/Vegas units built after 10/1/2014 have an 8000 lb hitch, before that date its 5000 lb. See here:
http://www.thorforums.com/forums/f9/...egas-1078.html
(I got the 10/1/2014 date from the Axis website earlier this year when it showed data for 2014 model year, now it doesn't mention that date.)