$3 grand to lift it sounds a bit extravagant for a leaf sprung rig, if they are just normal beam axles on rocker spring set up I could probably lift t for the price of 4 sets of U bolts and spacers.
I would certainly ask questions and be persistent, but have a look at your contract and see if it states what the suspension is then at least you have something to stand on, just the sticker and they will fob you off with" Oh sorry, you should have picked that up on delivery" don't go to a dealer about getting a lift either, if anyone will give you a quote without looking at it and telling you what needs to be done walk away from them also.
I see in the pics that you have off set axles fitted, to give you about 80-100mm of lift all thats needed to be done is to release the rear spring shackles on both sides so you can walk the axle out from on top of the spring pack, reconnect the spring and walk the axle back into place, same for the front axle except you would drop the front spring shackle..............you are not rotating axles or anything just moving the spring from under the axle to on top of the axle, only parts needed would be a new set of U bolts, fish plates and spacer...................alternatively you could get new 50mm beam axles which would give you a lift of 100-150mm..................changing wheel/tyres can gain 25 - 40mm...
Of course the procedure I outlined is just a quicky description but it is an easy job and doesn't require engineer stuff or anything, a trailer place would probably charge $300 -400 to do it.
@Boots in Action posted some pics of same sort of axle I will find the link.
Here's a pic of
@Boots in Action offset axle in the under spring position this has increased his height with no major changes or drama, while it's on a single axle the change is the same..
View attachment 59835