The problem is JIT is that mortgage documents have an all monies clause that means when you sell one property they equity must be repaid to the lender if requested.
A broker could qualify this though if I have the wrong terminology.
Whoever wants to lend me money I will borrow from.
I use to use stg, however now days have heaps cba stg boq anz bkw + other lenders.
I wouldnt reccomend as others have said using one bank as this will get you unstuck when the turn the lights on.