i have used tri and dual axle trailers. my experience is that your tow hitch hight must be spot on or you will have a few brown pants moments. !
My preference is the duel axle... nose weight is better on the back of the truck and very well behaved on a road trip with weight or without.
i have a road legal challenge 90, i went for a quote with the NFU with all the mods highlighted they were quite expensive. So i tried Adrian Flux and 3 party F and T was only £300 with limited millage (just said under average miles per year)
i thought it was pretty good