Has anybody had experience with Kirchner duals on a 7720 with non-planetary final drive? Are they placing an undue amount of stress on the inner wheel's bolt circle or the final drive itself? Love the thought of 36 inches of rubber on the ground on each side with 18.4x38 duals and not running on the rows. Only standard grain tank on this combine....no extensions. Are these worth a try or shound I steer clear? Want the floatation and stability of this setup, not to run in mud.