Hi,
I have a 790 with the box blade and 300x FEL. All together mine is 180 inches or 15 feet. I have been debating whether or not to buy an 18 as opposed to a 16ft. trailer. I am learning after shoppping around locally for a trailer that not all trailers are created equal. There are varying qualities of ruggedness in each length.
I am leaning towards a 12000lb 16ft. heavy duty trailer with brakes on both axels in case I ever move something heavier than my 790 setup. The price for this particular one is 3495.00 plus tax.
Hope this helps.