I have seen a few of the custom trailers on this site that use pontoon or utility trailers. Would a tandem axle trailer used for a 18-20' Deep V boat work for two three seaters and a standup?

The trailer is dropped in the center (V shaped) so something would have to be made to hold two three seaters level on the rear of the trailer. I'd like to put a SXR up front sideways.

Would a V shaped trailer like this be a good buy or should I look for a pontoon style trailer?

A new 3 place trailers go for 3500-6000. I think I could beat that price easy with some welding and a used boat trailer. What do you think?