Trailer for 20' MA

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Thinking about replacing my trailer some time soon. Current trailer is an old galvanized tandem axle with rear rollers and has seen better days. I am installing bunks on it this weekend (weather permitting) and will most likely have to do axles and leaf springs fairly soon as well. Before I dump a bunch of money into it, I started thinking maybe it is time for a replacement.

Just wondering if I really need a tandem or not for a 20' with a bracket & 140hp Suzuki 4 stroke. Saw a really nice, brand new single axle aluminum for a 19'-21' boat that was priced around $2200. Tandem axle ones area fair amount more. Should I just plan on saving up more for the tandem or will I be happy with a single?