I did a search thinking this would have been well covered in the past but came up empty and, while it doesn't answer my question, I did find this useful page.
I'm looking to make a SWAG at the travel in my leaf springs so I can lay out the curve and the mounting location for my fenders. I figure I'll allow as much 'wiggle room' as I can for when I actually install them, but I need to come up with a starting point.
Since the donor was a popup, it came with the dopey little 8" wheels. After mulling over a few options I've decided to replace the hubs when I do the bearings so it will be riding on the same 235/75/15 BFGs as the truck. Before I buy the parts, I need to approximate a compressed height for the springs and clearance between there and the fender so I can determine whether or not the forward edge will interfere with the door opening. I'm at a point now where I can still adjust the bottom corner of the door opening if I need to, but not for much longer.
The springs themselves are three-leaf and 32" eye-to-eye. The shackles are 3-1/4" long and the space between the bottom of the frame rails and the top of the spring is 7".
All those measurements are approximate since it's dumping rain out there so I didn't want to unwrap the trailer too much
The trailer is rated at 700 kg (1440#) gross, but that's just the upper limit for any trailer without brakes so I suspect it's more regulatory than actual. The donor was a 1974 Loughheed so there's no info for it the way there might be for a StarCraft or a Jayco. I'm still on track for around 1000# sprung weight.
I realize it's probably a guessing game at this point but any help in setting the height of the fenders from the axle center would be a huge help.