Will this work with roof bars that are a fixed positing / width apart? Cheers

Yes I think so. The clamps will go between any two of the cross bars and they are quite wide so they will take up some adjustment too. My car is a 08 Kia Caren's with the wider factory fitted roof bars, I fixed it no probs. Hope this helps.

What are the internal dimensions of the 46" x 36" tray? i.e. what size box could i theoretically carry in it?

Not sure, but be aware that the adjustable fittings sit a bit proud of the rack. I use a fabric roof bag and also a elastic bungee net for loose stuff.

Where are the measurements for this ?

Measurements for this are on advert and you can get them direct from max haul. Also there is a YouTube video on this as well

Manufacturer suggests using truck bed liner paint to protect this roofrack from rust. Will I need to sand roofrack first?

Although, I just remembered I added roof bars horizontally

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MAXXHAUL 50506 64" x 39" x 6" Heavy-Duty Universal Steel Roof Rack, Black

Product ID: 492858827

Details

Brand
MAXXHAUL
Colour
Black
Is foldable
No
Item dimensions L x W x H
162.6 x 99.1 x
Item weight
45 Pounds
Load capacity
68.04 kg

📦150 lbs load capacity

⚙️4-section modular design

🛠️Heavy-duty steel build

R18604

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Elevate your ride, own the road with MAXXHAUL power!

BUILT TO HAUL HEAVY - Robust steel frame supports up to 150 lbs of gear, from camping to furniture.
MAXIMIZED CARGO SPACE - Generous 64" x 39" footprint lets you pack more without compromise.
UNIVERSAL FIT FOR SU VS VANS - Versatile mounting fits a wide range of vehicles, ready for any adventure.
RUST RESISTANT BLACK POWDER COAT - Sleek black finish protects against corrosion, keeping your rack looking sharp.
EFFORTLESS ASSEMBLY PORTABILITY - 4-section design breaks down easily for quick setup and compact storage.

The MAXXHAUL 50506 is a heavy-duty universal steel roof rack measuring 64" x 39" x 6", designed to carry up to 150 lbs of cargo. Featuring a durable black powder coat finish for rust resistance and a 4-section modular design for easy assembly and transport, it fits SUVs, vans, and crossovers, making it the ultimate gear-hauling solution for professionals and adventurers alike.

Specifications

ASIN	B08G9H11ZV
Automotive Fit Type	Universal Fit
Best Sellers Rank	27,917 in Automotive ( See Top 100 in Automotive ) 39 in Roof Racks
Brand Name	MAXXHAUL
Colour	Black
Compatible with Vehicle Type	SUV, Van, Crossover
Country Of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (11,438)
Included Components	50506
Is Foldable	No
Item Dimensions	162.6 x 99.1 x 15.2 centimetres
Item Type Name	64" x 39" x 6" Heavy-Duty Universal Steel Roof Rack
Item Weight	45 Pounds
Load Capacity	68.04 kg
Manufacturer	MaxxHaul Towing Products
Manufacturer Part Number	50506
Manufacturer Warranty Description	90 days
Material Type	Alloy Steel
Model Number	50506
Mounting Type	U-Bolt
Number of Items	1
Number of Packs	1
UPC	812351035064

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