i talked to those guys about that trailer picture and it was custom buildt as is almost all of there product for a customer that was towing something real small and low thats why it needed the low profile tires,if i remember when i was looking at trailers from them there was not a huge cost savings just more the ability to get what you want.
my 2 cents when looking for a trailer is
if you are planning on doing any overnight road trips etc and your car is worth a pretty penny buy a enclosed trailer.
if you just need it for the odd trip to mission only ,and you have a pickup to load your extra stuff in buy a open deck .
and if you own a trailer don't tell anyone