I have a southdown tankguard
make sure if you have a lift and or bigger tyres that you buy the towing attatchment for a 110, as the disco one they sell leaves the towball about 3 inch too high on the bottom hole with 2 inch lift and 275/75/16s
I would have thought if you needed a tankguard you would have bigger tyres and a lift?
southdown are aware of this.
on a cold start, try priming the lift pump, if it starts ok,its air in the system,
probably something got disturbed in the test?
have a look at the sedimentor.
I have them on the back of my disco, as the springs are too soft for heavy towing, a few pounds in them stiffens the rear up,
one problem is you cannot use dislocation kit.
I got round it by welding a spring catcher on the turret.
The welding is a half hour job,
I usually clean the rust up and get back to decent metal, then holding a plate underneath seam weld from the top grind flat and fill, a coat of seam sealer/underseal from underneath and the job is done,
for the abs light check the wheelbearings.
You are doing it the wrong way?
most people fit bigger arches and a lift to accomodate bigger tyres, not look for tyres to fill and arch.
why not go for 275/75/16s and spacers if you want them sticking out more?