(For this discussion I am referring to typical enclosed cargo trailers, not flatbed or car hauler types of trailers)
For the OP situation (half ton or 3/4 ton truck, a sleeper in the truck shell, 1500-2000 pound payloads, and future migration elsewhere) I recommend a single axle trailer, likely a 6x12 size. Electric brakes on the single axle can be ordered or upfitted later. (tandem axle trailers always have electric brakes installed from the factory) Electric brakes on trailers require some type of brake controller in the tow vehicle, but most pickup trucks either are factory equipped or the controller can be added.
Let me ask you: aren't tandem axles helpful with not to sink and getting stuck out there?
There're more surface (though there's more weight too but not that much more). I might not be able to buy 4x4 truck, not sure yet.
I was saved by dually tires in 4x2 setup a few times, I'm pretty sure on that.
Also if a single axle/wheel on it fails, I still have the 2nd axle to get out.
For a female traveling alone in remote location safety and being able to get out/not stuck is one key consideration.
With single axle trailer weighting slightly under 1000 lbs, their GVWR is often under 3000lbs (sometimes 2000lbs!), so I might end up running close or over to GVWR, which I really don't like doing. Stuff adds up. I might want to put sports equipment in the trailer actually and that's going to weight, like barbell with weights, I want to a have options.
Yeah, brakes are an important consideration, I will think about it.
Pickup truck engine size V-6 or V-8, has no bearing on commercial vs private insurance, but it DOES make a big difference in pulling a trailer, and a tandem axle trailer EMPTY will weigh double, or almost THREE times what a single axle trailer weighs empty. That means a half ton or 3/4 ton pickup pulling a tandem axle trailer might be nearly half its trailer capacity before you load anything in the trailer. You really need a V-8, but a stout V-6 will do the job IF you are pulling a single axle trailer and IF you are not gonna be in the mountains.
Tandem axles I looked at weight around 2000lbs( about twice over single axle).
I want a truck with over 5000lbs towing capacity, as I might tow other stuff at times with it like a vehicle on a dolly, so it can easily tow tandem axle loaded as well. Lots of trucks have 5000-7000lbs towing capacity. I am going to be in the mountains a lot. I'm a careful driver and slow on uphill, never rush when towing. V8 I don't mind V8 of course, insurance told me to avoid anything over 250/2500 to avoid being hit with commercial (I have extra complicated insurance situation due to my residency, LLC owing vehicles, etc)
Tandem axle trailers nearly always are built with a LOWER ground clearance, (often using a drop axle) so the capabilities on rough off-pavement trails are greatly diminished compared to a higher ground clearance single axle trailer with a straight axle. (Axle lift kits can be added to most tandem axle trailers, but this raises the center of gravity)
Clearance is a big consideration. I notice cargo trailer dealers never state ground clearance.
I do not want to do axle lift, I want to minimize building and modifications efforts, this is for one more quick year of camping before international relocation, basically.
Also, most tandem axle trailers are 7 or 8 feet wide, causing more wind resistance, a drop in fuel mileage, and possibly reduced visibility using your typical rear view truck mirrors. Of course, towing mirrors can be added to the pickup if needed. Some pickups already have extendable towing mirrors from the factory.
I'm seeing 6 feet wide available, though. Plus you can have it custom built.
After fulltime boondocking in my class C all over, I can handle 7 feet width like it's nothing
) but yeah I want 6 feet wide max.
Cameras make maneuvering no big deal with bigger vehicles. I'm used to driving class C which is a big box, plus sometimes towing stuff with it.
Obviously if you are intending to load up an ATV, sideXside, etc, then a tandem axle would be better when hauling higher amounts of weight.
No no ATV, but generator, 40lbs water tank, barbell sport equipment possibly, extra fuel, propane tanks, stuff adds up, plus emergency stuff like construction materials, never know. I like to have extra room for loading. Like more water for long boondocks.
Another consideration would be that most small enclosed cargo trailers have a ramp door at the rear. Sometimes you can find one (or special order one) with the 'barn doors' at the back, if you prefer those. Barn doors are easier to find on single axle trailers, although they can be ordered on any tandem axle trailer if you really don't want a ramp door.
Yes, I'd want barn door.
In Texas, where I live, any utility or cargo trailer under 4500 GVW does not require annual inspections nor does it require a vehicle title. This can save some money and time. Check these factors in the state where you will be registering your trailer.
I'm visiting TX right now, I wonder actually if I could get TX title as out of stater here because I do have a temporary residential address here. I have very complex residency situation being international full timer with LLCs and ties to multiple states.