that is going to be my second mod on our 2012 1007. our wheel is almost useless. we like to situate our pop up in the site once we are unhooked from the tv and this wheel does not lend itself well to this task. i am thinking a lawn mower wheel would be a lot taller and almost the same width as the on you have on there now. have to see how that would stand up the the weight and lateral forces though. good luck, i am sure someone has performed this mod already.
2000 dodge ram laramie slt,cummins, 2014 jayco eagle touring edition 28.5 rkds, 1996 scamper 065s