After negotiation with Cheng Day, please be noted: 1. price calculation of TBH-750 w/o trolley is not same per TBH-500 w/o trolley nor FBH-500. We don’t think it is a good idea to remind factory to double check price of TBH-500 w/o trolley and FBH-500. 2. unit cost of TBH-750-6M w/o trolley is US$3,999.70/set which is quoted per actual manufacturing cost not by deducting transversing materials. 3. if there is problem on price quote of TBH-750-6M w/o trolley, we do sincerely suggest you to purchase complete TBH-750-6M set and keep transversing components (motor, wheels) as stock for urgently spare parts requirement. Hoping to have your understanding to accept TBH-750-6M w/o trolley by US$3,999.70/set.