A lot more details needed. Sunnybrook RV (manufacturer of Mobile Scout in Middlebury, IN) was purchased by Winnebago in 2010. Sunnybrook made trailers from 13' single axle trailers to 30' double axle ones with slide outs.
Winnebago has continued making Sunnybrook RVs and has archived information about Mobile Scout trailers by Sunnybrook here
If you own the trailer or have access to it, you could check the wheel size, lug pattern, axle capacity, and figure out tire needs from that information.