..In my opinion 3 wheelers are designed for a specific enviroment which shouldn't involve speed!. If there is distance involved in your lifts then choose a 4 wheel that can handle twice your max load!....then speediness is possible..
But if you want handling in tight spaces and a counter-balance electric then why look further than the Still R50 range..
..in 10 to 16 (1000kg to 1600kg) capacities..
**** ****....I sound like a salesman!!!...