Foobar's right.
If you do get the P6e or P7e, get the big chunky "flotation" tyres. They help loads for going in and out of fields. Though I do have a license to tow a bigger trailer, we found that the cost jump up to a braked trailer was too much, so just bought an unbraked one.
I've missed having the ability to tow a builders bag or sheet of plywood laid flat, but that's about it so far. It's certainly big enough for plenty of sheep!