Have always rec'd a lot of questions about my rear seat and roll bars. Most of these details are likely in an earlier post, but I'll summarize all together here for others to reference.
As much as I love the FJ40 jump seats, that wasn't going to work knowing that I'd have kids needing to be safely strapped in and comfortable riding long distances in the back seat.
To improve safety and actually gain rear storage space at the same time I did the following:
- ordered my Aqualu tub with a rear below floor storage compartment (they sell the storage compartment separate too); also installed an Aqualu storage tailgate for even more storage
- removed jump seats & installed a Man-A-Fre forward facing rear seat
- for kids too small for adult seatbelts, used booster seats with own seatbelts; these were locked in with generic black cinch-type seatbelts
- as the kids grew up, they used the 5 point rear seat racing harnesses that I installed from Crowe
- installed a dual hoop rear roll cage that bolts into OEM attachment points; mine is simply 2 stock hoops tied together with a section of straight tubing to ensure the hardtop fits over the cage
- installed padding on the roll bars; mine is actually 2 kits from SOR with some slight mods bc no one makes a kit for my custom roll bar
None of this looks "OEM Toyota". But this not about looks.
Man-A-Fre used to offer the steel frame rear seat but I think they may have discontinued it. It only required 4 holes drilled in fender well tops and had all the attachment points on it for seat belts. Frankly, it stiffens up the tub too. If they don't still offer the seat, see if they will manufacture one on a custom one-off basis. Probably was made by 4 Plus Products anyway so call them if MAF can't help you. See photos below for an idea of what it looks like installed.
This set up seats 3 older kids side by side (and did so once for a 5 hour drive) or 2 kids if in car seats or boosters or 2 adults. Should we roll over, the rear passengers are snugly strapped-in with a padded roll cage overhead.
The above is about as safe as you can make the rear of a FJ40. And gain some valuable storage space.
Here's a bunch of pictures to see how this evolved over time: