It is simple when you understand how an EE rating is applied to a lift truck. The actual EE rating lable or LPS or DS safty rating are applied by a UL representative as the unit was shipped from the factory. ANY modification to the electrical or fuel/exhaust sytem after it ships will void the EE or LPS or DS rating. If the customer insist a modification is required & must still have the unit rated EE, etc. it is an expensive proposition -someone pays all travel expenses for a UL representative to come out to the locations and a hourly charge for his time & documentation fee - need the BIG check book to pay the total bill.