Looking for a Aluminum Trailer, Need help.

I want to pull a 1985 Formula 302 SR1 w/Kaama drives.
Boat is 30'2"
6950 lbs dry so loaded with 155 gallons plug extras around 8400 lbs

I want to go with Aluminum. I was Looking to not spend to much. I saw Venture trailers around $5800 for a triple axle with triple brakes.

I was thinking would rather go with a tandem axle it would turn easier also have less tires, bearings, brakes, to maintain. Also I was concerned that they have just 2 large bunks holding all the weight.

I was going to call Manning tomorrow to see what they can do. Any thoughts on options or other trailers.

Boat near Detroit.

Mannings are great trailers and they are really great for the money IMO. I bought an Aluminum painted MYCO last year and it is a great trailer but they are not cheap by any means!