Lee, when I began looking at the Flagstaff, I started off wanting the model you have. DH asked about turning the axle and lifting it. After DH and salesman and repair tech looked, they decided it was not possible - not enough tire clearance in the wheel well. We even asked if we could order the storage model on another frame, but they said it was not possible. I was very stuck on wanting a unit that sat slightly taller on the road to avoid bottoming over dips and ruts and such....like what would occur with the previous travel trailer.
Luck have it, I found the toy deck model - it did have the clearance & at the time (in 2012), came in slightly larger tire size. I wonder if the toy hauler model has a different frame? I was told that it is the same frame as FR Off Road Toy Hauler Tent Pop Up Camper frame....maybe this is why it takes a 2-5/16 ball and Class IV hitch? Because of the anticipated weight and work load expected?
My friend who has the 2013 model, we looked at her model, it appears the same, but the tire clearance is closer to the wheel well than mine. DH said I could put 15" tires on, but does not see the point...said since it sits high anyway and should be fine trucking down the bumpy roads and fields where show parking sometimes is...& of course, speed is also a bottoming out factor on grubby roads. yikes.
I dunno, I make no claims to being mechanical, just sit on the side lines and listen to DH & service/repair tech talk....it'd be cool if you could find a way to raise it. I love the slight height diff from the travel trailer to this A-Frame.
2012 FR Flagstaff T12SDTH
1996 Shadowcruiser Pop Up Truck Camper
1967 Newell Motorcoach
2003 Ford F150 5.4 V8 Triton Super Cab
2004 Nissan Titan LE 5.6 V8 4x4 Crew Cab