Transferring to US office

[SkinnyPete]

Due to the niche market that we work in employees have the opportunity to transfer between offices (EU and US) quite easily, the role that I do now in the UK office has just become available in the US office.

I have applied for it and my employer is entertaining it, before formal negotiations begin can anyone tell me what is the norm when it comes to relocating?

For example, is it reasonable to expect an employer to arrange or fund accommodation during the length of the arrangement (1 year at a time I believe)?

How many trips a year back to the UK is reasonable, 1 every 3 months?

[SkinnyPete]

Thanks for the feedback everyone however I have just accepted a job at another organisation so no US life for me.