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I have built hundreds of utility and single purpose trailers so here is my nickels worth. First of all, well done. It sounds like you have thought out the structural aspects very well. However here are a few things to consider. 1) What material is it made of and how will you finish it? Corrosion is the biggest enemy of any boat trailer. 2) Have you thoroughly thought through the tongue height? Sounds like it may be too low depending on how your tongue is attached. 3) Are you sure your spindles and wheels are up to the task? Your average VW weighs about as much as a can of soup. It sounds as though you have engineered a stout trailer. It would be a shame if your spindles broke or if you couldn't get tires that were rated high enough for those small rims. 4) Axle placement is going to be your toughest challenge. You have the opportunity to get this trailer absolutely right but you have really got to think this through. Forget general rules or such things that others may tell you. Go to the Dexter Axle website and learn about proper axle placement then apply that knowledge. The last special purpose trailer I built was my welding trailer. I have a welding business and this trailer has everything I need to do my job. The welder is mounted over the axle but in my calculations I realized that 1/2 inch differance in axle placement or position of the welder would make several percentage points differance in the tongue weight. I recommend placing the axle to your best calculations (including the boat) then place the loaded boat on the trailer and adjust it forward or back to achieve the correct tongue weight. Once you have figured the correct positon attach your mounting hardware so the boat is always loaded in that position. Hope that helps, Terry
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