The reason I ended up with a P1 was no bed on the P5, the dump bed wouldn't have made a difference, the dump bed's greatest asset is for cleaning on the PI, really liked the size of the P5. But made the right choice for us, two people and three dogs wouldn't fit very well in a P5, I had no idea the pups would love to ride as much as I.
I'm not sure I understand. You bought an expensive, large, effective jeep that can't drive on roads just because you have dogs?
I assure you that many P-500 owners are also dog lovers.
I won't begrudge the purchase of a P-1000, it is an impressive machine. It's also very big and relatively heavy. That's a problem where I live. Um... dogs aren't, and they can walk.