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I did some checking and my ladder on my Winnebago Access is indeed NOT grounded. Based on my research most ladders are not ground and do indeed need a NGP antenna.
The Firestik NGP antennas look to be the best. They sell a kit that includes the antenna and a 3 way mount (ideal for ladder mounts) and run around $40 to $50 for the kit. I just need to decide what length of antenna to get.....I am leaning toward the 3' version which should give me 12" to 18" above the RV.
It is important to remember that a ground plane is not the same as an electrical ground and although your return coax might be grounded because your radio chassis is, what your ground plane is providing is a something for the RF your antenna is radiating to "push" off of and go up into the air. I've found that NGP antennas might work for short range but they really shorten the distance you can expect for decent communications.