The National seal part number 442251 that you mentioned has the exact same dimensions as what comes with the Bearing Kit part # BK2-110 so it would work great. What comes with this kit is a double lip seal compared to the single lip seal of the part number you mentioned. This just means the seal will do a better job basically. Especially if ever backed into water. view full answer...
I confirmed with my tech at Swagman that the distance between the center of the pinhole to the outside edge of the furthest wheel hoop is 20.5 inches on the Traveler XC2 # S64663. I went ahead and attached a picture of this measurement to provide you with perspective. view full answer...