OK I have had a 8 X 10 Enclosed Trailer for four year since it was new.  Well since we use it to go everywhere, but not off highway because it only has the standard (205/65/15 [27"} trailer tires, I figure it's time to fix that and runs some 30 to 33 inch tires and get some good ground clearance.

So the butchering starts:

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Ok update on build plans.
We will be switching out the 3500# axle with a six inch drop and 5 bolt hubs for a 5200# axle with hydraulic shocks and a four inch drop .  The new axle will have a 6 by 5.5 bolt pattern so the same rims will fit both the trailer and tacoma or 4runner when towed.

Fewer spare tires to carry and having 31 or 33 inch truck tires on the trailer will allow me to air them down.

There are plans to change the hitch from a 2" ball to a more offroad friendly system. I have two to pick from right now but if anyone knows a good offroad hitch please let me know. The more options the better.

Glad to see your changing axle. This whole drop axle flipped upside down thing is a little sketchy to me when it comes to a trailer that will be loaded.

Having a drop on the axle that extends down from center is no less stable or prone to breaking, then if the off set was above the axle's center.   Go look under any toy hauler style camper and you will see that they use drop axles with the offset below the axle. The main reason for the axle swap is to allow me to run the same tires and rims as the Tacoma.

The stock trailer tires are 27" and need to be at 50psi to carry the weight because they are so narrow.  That means they are very bouncy and prone to damage on the trail.  With 32/33" truck tires I can air down and avoid that same damage.  I will be taking 2" out of the suspension, but adding 2 to 3" with the tire. Shocks to damping the bounce which help too.

I have already test towed the trailer behind the truck and it is very stable even at 60 to 65 on the highway. 

I will likely go with a Luenette ring( the hoop that goes on the trailer) and pintle hook on truck. I can get a ring that will turn 360° on it's axis so if you flipped the trailer or the truck you don't pull the other unit over with you. The ring is rated at 17,000# for trailer weight and 1'700# on the hitch...it may be strong enough.

The hook and ring is good because I can get parts anywhere.