I have used a large 3 rail Holsclaw open trailer for 30 + years (& many thousands of miles) to tow dirtbikes. I have occasionally used it to transport streetbikes.
This style trailer does not require a large vehicle or impact gas mileage significantly as it is light. Mileage penalty is approx 10% using a 06 4runner V8 for towing w/ two bikes.
Open trailers have a security issue. I carry locks & cables to reduce theft risk.
Enclosed trailers have a significant mileage penalty but have many other advantages.
Open or closed, I would recommend you seriously consider an aluminum trailer, if you can source one within your budget.
This style trailer does not require a large vehicle or impact gas mileage significantly as it is light. Mileage penalty is approx 10% using a 06 4runner V8 for towing w/ two bikes.
Open trailers have a security issue. I carry locks & cables to reduce theft risk.
Enclosed trailers have a significant mileage penalty but have many other advantages.
Open or closed, I would recommend you seriously consider an aluminum trailer, if you can source one within your budget.