A scenario probably closer to the truth: Stuff like that isn't normally administered by hotel/RV staff. If you're lucky, you'll be given a tech support number (if you're real lucky, it will be toll free) that will place you on hold. And hold you will!
The hold will finally be answered by a level zero to one tech that (again, if you're lucky) will understand your angst, but will be powerless to help. The best you'll get from him/her is a quick visit of your tcp/ip settings. Tickets will be filed, promises made, but expectations should remain low.
Everything said here is accurate, but one thing that's been overlooked is that all the inbound ports will have to filter to your specific IP. Most wlan setups use dynamic IP addressing (DHCP). Assuming that you convinced the tech support guru to forward everything to get it to work, her/his shift replacement 6 hours later won't relish reforwarding allllll those ports to your new IP. Mac address redirecting should be your friend, but that probably won't happen either.
There's a reason a lot of hotels chains decide to give this 'service' away: if you aren't happy that your setup doesn't work, you aren't being billed for it, and theoretically can't ask for a refund
With the above said, a suprisingly high number of wlan broadband setups do allow for VPN access. A potential workaround is to do a VPN-esque tunnel to a host computer on a dedicated ip, or dynamic dns service. This would be your home computer, and -your- router would be in control!
You'd need XP Pro (home?)/WinNT/2k/2k3 as your 'host' computer. I'm sure there are VPN services that will work on any flavor of operating system you throw at it, but I don't know what they are
I think XP home/pro has a built in VPN client. Setup the Wlan, vpn back to home, and route your ac traffic across your tunnel.
A bit much, I know. Good luck!