As far as the large trailer, I'm happy with what I have. I have a 30' flatbed tralier, a big flatbed truck, and a big ol' forklift. That's what we use to handle mulitple spas. But I want to upgrade my small trailer to the new style. That way I can tow it with my jeep or really any regular vehicle because the cover slips under the spa. Mine works just great, and the only difference is the cover slot.
I only want to upgrade in case I have to deliver a spa on the way to the lake, or on my way out of town to go 4-wheelin' or something...
8-)