Have you downloaded and read the Dexter Applications Manual from their site? You said you spoke to a Dexter guy. Was he at a dealer or Dexter?
I would suggest that you read the manual and make a list of questions. Then, speak to someone at Dexter. Ask the right questions; get the right answers.
I don't mean to cast aspersions on any of the previous answers. They are all good. But they are based on personal experience and opinions.
You are going to be living with this thing for quite some time, so it behooves you to benefit from Dexter expertise.
I say all of this because, in rereading the posts, there are a number of exchanges regarding trailer height, ground clearance and such. Per paragraph 4 on the second page of "Trailer Design Considerations" begins, " Torflex axles ride performance is at it's best when the torsion arm is at or nearest the horizontal when the vehicle is loaded at it's rated load.....". It then goes on to explain the how the geometry of the system is effected as the down angle changes.
From this, I'm gathering that down angle should not be used to determine trailer height, ground clearance, etc. Leave that to the wheels and tires
The real key here seems to be getting a realistic picture of your expected loaded weight
. "Trailer Weights In the Real World" is a good starting point. Ideally, you would have the trailer weighed and then weigh all the items you plan to add and to pack. This seem like a lot but, as said, you will be living with this one for a while.
Lastly, you may want to consider larger brakes
. In several recent threads, Scamp
owners have mentioned that 7 1/2 inch brakes
can't be locked up on the highest controller setting. This means you have no leeway in controller adjustment. The normal procedure for proportional controller adjustment is to set the power at about mid-way and then, driving 20-25 mph on a dry roadway, push the manual control to max. If you get lockup, reduce the power setting to just before lockup. If you don't get lockup, raise the setting. When you achieve lockup, back the power setting back, just short of lockup. Recent comments indicate that with 7 1/2 inch brakes
you can't achieve lockup, so in an emergency situation.............?