Car Haul Trailer, Steel vs Aluminum, Which Would You Choose?

Your only talking about a 3300# car. If you have two 5000# axels your total capacity is 10000# . If trailer weighs no more than the car your at 6600#. Assuming 20% ( 1320#) of that weight is transferred to the pickup you have 5280# on the trailer axels ( a little over half of the trailers capacity). I wouldn't be worried about a half ton pickup especially if your upgrading in the near future. A weight distribution hitch with anti sway feature is real nice but not mandatory. Some would not believe what we did with a pickup on the farm. Keep 60% of your weight ahead of a point between the two trailer axels. DO NOT GO TAIL HEAVY.
By the way I prefer steel, you or a friend with a welder can fix or modify it. I have seen some who were supposed to be able to weld aluminum and it failed quickly.