Dolly -----http://chattanooga.craigslist.org/fod/5634101849.html
Hitch height ------------I would measure the dolly hitch level and the MH 2" square hole and subtrract the two to determine how much drop needed for the slide in part.
decide the drop---http://www.walmart.com/ip/Reese-Towpower-Interlock-Hitch-Draw-Bar/15125819?action=product_interest&action_type=title&item_id=15125819&placement_id=irs-106-t1&strategy=PWVUB&visitor_id&category=&client_guid=d670b244-f4e0-47fe-bc64-cba7b7c24fcb&customer_id_enc&config_id=106&parent_item_id=16880815&parent_anchor_item_id=16880815&guid=8ade9727-e3e5-4dfb-b224-dfd3f24cf227&bucket_id=irsbucketdefault&beacon_version=1.0.1&findingMethod=p13n
NOT THIS-------http://www.harborfreight.com/triple-ball-trailer-hitch-61914.html
BUT THIS --https://www.etrailer.com/Balls/Convert-A-Ball/901b.html
Just my opinion.
