I'll vouch for an aluminum trailer. I spent much time looking at friend's trailers and being indecisive about a trailer. I know I wanted double axles for better tracking and security, and a large load capacity.
I was also worried about repair-ability in backwoods places, so steel was attractive. Originally I was looking at a car hauler type trailer, solid, double axle, sturdy, etc. I priced one locally at around $1700 new. Most weighed around 1500lb.
I had also looked at aluminum trailers, most were snowmobile trailer with tiny tires, but were light, the small tires were a no deal, I've seen several other snowmobile trailers literally burn up axels or through the rims off.
I ended getting an AlumaTtrailer, w/ 14 inch rims, 2 * 2500lb axles, and 16 foot flat deck. It was pricey, but weighs 650 pounds, and will carry 3 loaded big boats cross country. I have a large truck so pulling a car hauler wasn't an issue, but now I can offer up my trailer and a frontier or tacoma can pull it with a large load, if you get a large steel trailer you'll have less friends that can pull it and you'll be truck and trailer bitch forever. I figured the extra money would pay for itself in saved fuel, and it has. I took a loaded car hauler several years ago to Deso, got about 11 mpg, I can take the same load on the aluminum trailer and get around 13mpg, or over 10% better mileage. A trip around ID, MT, UT, with 3 boats an 4 people in a Titan and LOTS of gear we got 15mph, the extra 800-1000lbs would have killed the mileage and slowed us down on the hills.
For repairing, the axels and the mounts are steel and bolted to the aluminum superstructure. The only complaint I have is that the aluminum deck is easier to scratch/gouge than steel or wood, but no big deal. The nice part is that other than the axles nothing can rust. For trips with several people I can load the truck and trailer to the gills, and the people can ride in the subie wagon or Westfalia, not a problem to have 6-8 people and only 2 vehicles for long trips. Saves on fuel, shuttle, etc....
Check out a an Aluma Dealer www.aluma
Not sure of the options would want, but any decent welder could do it,