receivers and ball size for 7000lb GVWR trailer

I have a bunch of Class 111 2 Inch tube receivers w/ 2" balls and 1" OD shank. Can I replace my 2" ball and use a 2-5/6 ball w/ 1" OD shank to tow a 7000 lb Ultra LITE 22 ft. Trailer. Hitch wt will b...