Saying no to the Jayco.. just can't do it. Particularly the 10y, as with the 8' box it's just too small. Plus, that's a lot of money to drop on another camper, and once I had the bikes unloaded I'd just be bummed I had a smaller camper. There are others on the market as well, but all pushing the $10k mark, which is way more than I want to spend.
But here's an E-2: http://denver.craigslist.org/rvs/2960228907.html
Here's a gazunga huge Starcraft: http://denver.craigslist.org/rvs/2988939921.html
A Forest River http://denver.craigslist.org/rvs/2994176538.html
another ridiculously huge one http://denver.craigslist.org/rvs/3014262399.html
If money, space, and practicality weren't constraints, I'd like to go this route though for $15k. http://denver.craigslist.org/rvd/2988471040.html
this could be the next phase, presuming the whole family is into bikes in 4-5 years.
For now, I'm going to stick with what we got, and work on getting a new axle with 5x150mm hubs and M14 studs. Then build up a new frame & do a box swap.. plan 1 above.