Hey Duffman,
Awesome that you're gearing up to take the family riding -> brings back a lot of great memories with my girls (including the memory of being able to keep up with them on bikes!).
Good advice in this thread so far. If you're up for some more:
1. 1up are by far the easiest to install/scale/store due to the weight/size of their modules and simple design, IME. For a street-parked car in the city, they are perfect. Less than 2 mins to have a single tray rack off the back and stowed in the hatch. Add on trays are slightly slower to put on, but lighter/smaller to store. If they still support the config, I'd go with a single tray rack at the car + 1 add-on per family member. This is because:
2. 1up are not great at ease of supporting multiple wheel sizes from a single tray. A significant change in wheel size requires getting a wrench, keeping track of spacers, etc., while most other racks either have sliding bits* to accommodate, or can be managed w/straps. Having single/dedicated 1up trays for each family member would allow you to choose, e.g., just the one set up for the 24" wheels if you are only riding with the one child that day (assuming the base rack has the tray for your 29er). Add on trays can be attached in any order, and changing the wheel size of trays as your kids grow and get new bikes is no big deal. A single config can support 27.5, 29, 700c, so grown-up trays are more flexible.
Not sure if this link works, but I found a picture of a 1up with a similar use case to yours that shows how the arms are set up to grab different tire sizes, but also shows how massive these things get (any 4 bike tray rack) for your parking consideration. Also, that RAV4 is gonna steer pretty differently all loaded up!
https://images.app.goo.gl/u5TCh2aSKCTyin9EA
(It comes from this article I haven't read:
https://kidsridebikes.com/1up-usa-he...e-rack-review/)
3. I know you don't want 2 in back + 2 up top, but for usability, with multiple kids bikes used daily (school pickups), I found it best to have racks up top that could slide to support different wheel sizes, fenders/racks, etc. even though a 1up single tray lived on the car. Maybe you can slide the roof box over & do 3 + 1? I did this on a 2004 Outback. If willing to consider a rack up top, we found tons of flexibility with RockyMounts Brass Knuckles (similar mech to SplitRail tray rack mentioned earlier). Those fork mounts Frorider linked look really cool, but few kids bikes have Thru or QR axles, so that means your Ibises would go up top, leaving the 1up wheel size conundrum for the rear tray rack.
Hopefully something useful in there, else sorry for so many words.
Good luck with getting to the right solution!
* 1up did introduce a sliding mechanism to adjust for wheel size as an add on a few years back, but I no longer see it on their site, and it doesn't look like any of the racks come with it.
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