We use the 7 foot wide ones in our handyman division.
Had a 7 footer to start landscape. It will do but- we use 60" decks on the Z mowers That is 5 foot wide which leaves less that a foot on both sides. The racks that you have will be on the inside of the trailer and the whole size of the tool will be in it also- meaning that it is much easier to hit your back on the rack or tool. I KNOW!
Both 7 footers had the wheel house on the outside of the box which left room inside-BUT- the overall width of the 7 foot trailer was wider than our 8'ers with the wheels inside the box. That means less curb damage to the tires. The 7' was a little wider than the dually where the 8 is right in the track.
Also for mowers, we put a 48" or 44" AND a 36" W/B up front SIDE by SIDE.
Than the Z will go behind that and even a 21" behind the Z sideways in a 14 foot trailer. That trailer can handle any of our properties. We can not do that with the 7' trailers.
Our 8' trailers are both 04 and are the Pace Summit landscape trailers, well set up from the factory but with E track on the walls at 18" and 48"- 6" of extra height- 10,000# weight cap.- and spare tire rack, (but no tire)- Out the door about $5200.00 We bought 1 new 7x14 Cargosport by pace and it was about $3900.00, the other was used- 1 year old in 2002 and paid $2600.00 for it. Our open 6x16, 5000# with brakes was $1500.00 and our 6.5x12 3000# no brakes was just over 800.
We just picked up a used Pace Journey- the cheapest model they make- 5x10 enclosed and in like new shape for $900. It is just a tool storage trailer for rehab homes so the fact that we can not stand up in it is not too bad but if you want a landscape trailer make sure it is tall enough.