One thing to think about is having a vehicle powerful enough to tow the trailer you buy.
Check your vehicle's tongue-weight capacity, and tow-capacity.
If you match these stats of the trailer (don't forget the weight of the Spyder in it) to the maximum of your vehicle can handle, you will have a difficult time hauling the trailer on the varying terrain you will find across the country. You need spare towing capacity... trust me. Having a vehicle that is at its limit towing a trailer is a workout on a long trip, and doesn't exactly treat your vehicle with the best of care.
While you'll hear all kinds of testimony of people that have used all kinds of cars, SUV's, and trucks to tow their trailers without problems -- trust me... you want to have the power to tow the trailer you buy.
Obviously, the bigger, heavier, and more "boxy" the trailer is, the more power you'll need to comfortably tow it.
Just a suggestion to think about from someone that has trailered things for over 45 years...