A trailer is better than a truck. Harbor freight has a folding one that can be stored vertically. 4'x8' bed so you can haul full plywood/drywall/MDF stacked flat. Better than any truck bed and lower for easier loading.
Would my Ford Focus be able to pull it?
It's not ideal, but use what you have. Personally I got a crossover which is far more comfortable for the price range than a pickup for the 95% of the time that I am not hauling anything, and it tows great. I do keep it under 3500 lbs. though.
If you don't have to go on the highway there shouldn't be any problem. But high speed plus high towing resistance won't be good for your transmission, particularly on a light car with a bare minimum transmission.
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