The BX should be enough for your needs. Having a backhoe is really handy!!
I agree with others that $5K seems a little high for a 6K trailer. I just picked up an 18' RICE trailer this weekend. It's a 7x18 10K Car Hauler and it was $5350. The 18' 7K version is $4490... 7K Car Hauler, the 16' is...