Welcome laxchatter.  I have seen an after-market grill that attaches to a hitch receiver, popular with the tailgating crowd.  The r-pod has a receiver on the back (where the spare tire is attached) so you could buy one of these grills and use it with the 'pod (with an adapter).  I just did a search and here are 2 examples:   http://%20www.barretire.com/LA%20Parts/freedomgrill.htm - http:// www.barretire.com/LA%20Parts/freedomgrill.htm

You would have plenty of room for 2, my family has 4 and we are fine.  The only time we are all inside is to sleep and then in the morning for breakfast and showers.  If you use an external shelter like an EZ-up (great on the field, too) or the r-pod's shelter there is plenty of room to hang out outside if its raining.  The 'pod has 2 inches of insulation all the way around so if you travel over the winter you'll stay warm.  Many other travel trailers have less insulation (and popups have none)  Many poders have found they need to keep the bathroom vent open an inch or so and a window cracked open to keep condensation down - its sealed and insulated so well your own breath is an issue.  Also no problem with storage.  On weekend trips we only use about half of the 'pod's storage and the minivan is only about half-full with chairs, EZ-up, firewood and bikes.

Our daughters cheerlead.  Last year my older daughter was on a travel team over the winter.  I wish we had used our popup camper for the longer trips, it would have been cheaper than the hotels even with the propane to keep it warm.  However, with the freezing temps using the water system would have been impossible, so showers and toilet use would have been necessary at the bathhouse.  You'll have the same problem with a 'pod and most other small trailers, the underbelly isn't enclosed so you can't use the water system below freezing.  Many campgrounds are closed during the winter for this reason and the ones that are open may not allow you to hook up to water (its probably off).