Ken in Anaheim said:
I've never pulled a trailer before. Let's say the 6x12. Do they have their own brakes ? How small(big?) a vehicle would you need to tow them with ? How would they effect mileage ?
KinA
The weight of the trailer dictates whether or not it needs electric brakes. My 6 x10 (box size) Wells Cargo is light enough that it doesn't need them. My 15' definitely did.
Also, the jurisdiction that the vehicle is registered in. Here's the link to the Canadian provincial regulations, which while it won't apply to you, just goes to show that they all do their own thing.
http://www.rvda.ca/ProvBrakeReqts.asp#ON
As to vehicle size that depends more on the towing capacity than the size. An Astro/Safari minivan, depending on engine size, AWD or not and year has a towing capacity of up to 6,000 lbs IIRC. A front wheel drive minivan has very limited towing capacity.
When I towed the 15' trailer behind a full sized Ford E 150 I definitely knew I had it on there but then the trailer had 7' ceiling height so it definitely stuck up higher than the van and caught the wind.
The smaller trailer behind the Astro was hardly felt unless there was a cross-wind and of course on take-off from a full stop.
IIRC the Astro dropped maybe a couple of miles per gallon with the trailer on it.
It's really hit or miss with so many variables...size of trailer, make of trailer (some tow easier than others), tow vehicle, engine size, etc. etc. It also depends on what you've got in it too!