Good stuff! As Evdoalex mentioned, a range extender can help where you need to connect to the ethernetless router.
You know, you could use the device I mentioned in this thread http://www.rvforum.net/SMF_forum/index.php?topic=20729.0 and placed in proximity (within 50 or 100 feet) of your cradlepoint router, this repeater/extender would auto connect to your cradle point and you could plug an ethernet cable into this little repeater and have access to your cradle point in addition to repeating your wifi signal in the direction the antenna is pointing in. Point the repeater to a friend's RV way across the park so they can have wifi access to your Verizon card in the Cradlepoint (or whatever cell card router you are using). If need be, you can WEP secure the repeater's connection too. You can turn off the autoap function and manually connect to the cell card router with it if you wish. A picture is attached, and you can use it with the stock Linksys antennas if you don't need to beam the signal across the park or something. A friend can use this thing to connect to your cell router from across the park too so he can use it's wifi or ethernet in his own rig. Just thought I'd mention the options available because these routers like this Cradlepoint and the others mentioned are totally awesome but not everyone has one. I spent 35 bucks shipped for the router, the firmware was free and the tripod was 17 bucks and the antenna was 35 bucks shipped.
If the company ever supplies me with a cell card for my online manual access in my Cummins service shop truck, I'll look at this thread and get one of these cell card routers with my own money. Thanks for the info.
Bob