Fixed or sliding spread on a drop deck

For canada open spread is 20,000kg = 29,500 lbs roughly that is In MB/SK/AB/BC. The remainered of canada is 40,000 lbs usa . Forget Lbs to KG.
Ideally the best trailers are canadian made. Manac, doohan. They make 53' steps that are 3 positions slider . Up for cali back for Canada. Its it true its best to have a trailer that can open to a spread and close to be a tandem. Open spreads do wear on tires more. Note these trailers are very hard to find used . Mostly new is only thing out there. Trust me ive been looking for 2 yrs . Otherwise u have to import a used stepdeck/flatbed.