I replied to your PM, but I can't make attachments, so here is the build sheet for my
Scamp 13'
NOTE: I updated to have them build a 5 on 4.5 axle instead of this 4 on 4.5.
Of course you'll need to measure YOUR camper and not use my measurements.
Cost in April 2021 was CAN$500 for the axle+brakes, CAN$220 shipping and CAN$30 for brackets.
My <mostly> local welding shop charged something like US$1,800 to chop the old one out, add better reinforcements to the 4" lift someone else installed, weld n the new axle, remove and replace the coupler and add chains.