Keep in mind on trailers most trailer companies build trailers to make money, this usually leads to skimping where ever possible. Just because a trailer has a 3500lb axle doesn't mean the trailer is rated for 3500lbs.
I realize you need the trailer immediately but most people who throw a raft trailer in there lineup don't really think them through too well because they never use them in the real world they just build for profit. I see a couple major flaws to that design for being a good raft trailer, it is probably equally as poor as a cargo trailer so just be aware that it may not do either really that great depending on how you use it.
The red flag should pop as soon as you see 3500lb axle. That tells me they are going cheap with that sprung axle and they have no idea how to match an axle to an aluminum trailer. That thing is going to ride like hell towing rafts and bounce all over , you will have to air down to control it. The underside construction tells the tale. Box tube doesn't mean much because they usually down size the wall thicknes to save money because they bumped to box so it looks stronger and better built all the while giving you nothing more and costing no more to produce. Sealed bearings on the axles? Thin walled tubing along with poor design and wrong temperature welds can make aluminum crack and run like a bitch. Thats what gives aluminum a bad name is people who don't know how to properly fab it.
When you see things that are substandard you can guarantee they are also in places you can't see, check construction out really well and find out the wall thickness and if the tounge actually is tied into the frame correctly. I wouldn't put a sidekick on that trailer I guarantee it isn't braced for it and it probably has cheap low rated tires on that trailer from the factory.
Terrible cargo trailer but you won't find a better raft exclusive trailer anywhere.
I know not everyone can have multiple trailers though
do your homework