Wholeheartedly agree with
@Drover on the levelling approach.
After a while, you get a fairly good idea of whether van is level or not just by looking at it. Then, if in doubt, the cheap bubble thingy gives almost enough info to make minor adjustments.
We've found that about 10 mins effort to set up the level once beforehand by
- Getting van as level as possible when at home or at a good level campsite by using spirit levels, bubble levels or whatever
- Then putting the bubble thingy inside the freezer compartment of the fridge as it's the fridge which really needs to be level
- Adjusting the level, if necessary, so fridge is as level as you can get it
- Take out bubble thingy and mark where it is now...sometimes the draw bar placement gives a different level
- Note what the bubble thingy tells you for a level fridge
- Use that for all future setups then there are few problems
It's worked well for us on several different vans and we rarely need to adjust it. We do carry a couple of thinnish pieces of timber and that seems to be all that's needed. (And one flat piece to always put under the jockey wheel)
Also, when overthinking future requirements, you often end up with a heap of things you think you might need or that someone has told you that you have to have....and never or rarely need.
Everyone has a different style of camping and need different things so best to hang back where possible and decide later once you've had a really good look. If you need stuff, Jayco shops give the 10pc anyway but there are often other or better places so shop around.
One item I'll differ from
@Drover about is the van mover. Our optitech is portable, not fixed to the van, lives in the shed and is only used to get the van back in the shed at home. But when we need it, it's there and used! I can't see the point in the onboard heavy van movers, but that's a personal choice .The optitech cost us about $2500.
But it's the needs that are individual and not everyone is the same!