Good choice, Donna. I think you'll like that trailer. I've had my flatbed for over three years and it's a great piece of gear.

For a while I was using it almost daily. To the point where, when I went to a rack and panniers on two of my bikes, they felt weird without the trailer back there.

I modified my flatbed by taking the rear reflectors off the aluminum tabs, rotating the tabs 90º so they point outboard, and clipping a Cateye TL-LD500 on each rear corner of the trailer. Two active lights and reflectors on the back. A zip-tie run through the hole in the end of each tab keeps the lights from sliding off the ends of the tabs, although the fit is tight enough that this doesn't seem it's ever going to be a problem.

I have used my daughter's Solo as a covered utility trailer and have found the Flatbed to be much more versatile.

Some thoughts on modifying the trailer to carry more weight:
I think the 100 lb. limit is conservative on the part of Burley.
I know the 15 mph speed limit (do they still put that warning in the owner's manual?) is way conservative.
I think a solid bed and a solid axle would allow the trailer to carry more weight.
It wouldn't surprise me if modifying the trailer like this to carry more weight voids the warranty.